J/AJ/108/1722 Blue horizontal branch stars (Kinman+ 1994)
The structure of the galactic halo outside the solar circle as traced by the
blue horizontal branch stars.
Kinman T.D., Suntzeff N.B., Kraft R.P.
<Astron. J. 108, 1722 (1994)>
=1994AJ....108.1722K 1994AJ....108.1722K
ADC_Keywords: Stars, horizontal branch ; Stars, blue ; Photometry, UBV ;
Photometry, uvby, beta ; Abundances
Abstract:
A complete sample of blue horizontal branch (BHB) stars in the
magnitude range 13.0<V<16.5 is isolated in two Galactic fields that
have previously been searched for RR Lyrae variables: SA 57 in the
Northern Polar Cap and the Lick Astrograph field RR 7 in the
Anticenter (l=183°, b=+37°). These BHB stars are a subset of
the AF stars found in the Case Low-Dispersion Northern Survey; lists
of these AF stars were made available by the late Nick Sanduleak. The
completeness of the sample was confirmed by reference to the
photometric survey of SA 57 by Stobie & Ishida (1987AJ93..... 624S)
that is complete to fainter than V=18. In the color range
0.00<(B-V)0<+0.20, we can distinguish the BHB stars among these AF
stars by comparing them both with well known local field horizontal
branch (FHB) stars and also the BHB members of the halo globular
clusters M3 and M92. The criteria for this comparison include (1) a
(u-B)K color index (derived from photoelectric observations using
the Stromgren u filter and the Johnson B and V filters) that measures
the size of the Balmer jump, (2) a spectrophotometric index A that
measures the steepness of the Balmer jump, and (3) a parameter D0.2
that is the mean width of the Hγ and Hδ Balmer lines
measured at 20 percent of the continuum level. These criteria give
consistent results in separating BHB stars from higher gravity main
sequence AF stars in the color range 0.00<(B-V)0<+0.20. All three
photometric and spectrophotometric criteria were measured for 35 stars
in the SA 57 field and 37 stars in the RR 7 field that are in the
color range (B-V)0<+0.23 and in the magnitude range 13.0<V<16.5. For
a small number of additional stars only (u-B)K was obtained. Among
the AF stars that are fainter than B=13 and bluer than (B-V)0=+0.23,
about half of those in the SA 57 field and about one third of those in
the lower latitude RR 7 field are BHB stars. Isoabundance contours
were located empirically in plots of the pseudoequivalent width versus
(B-V)0 for the lines of Mg II A4481Å, Ca II A3933 Å and
Fe I A4272Å. Solar abundances were defined by the data from main
sequence stars in the Pleiades and Coma open clusters. Data from the
BHB stars in M3 and M92 defined the [Fe/H]=1.5 and -2.2 isoabundance
contours, respectively. Metallicities of all stars were estimated by
interpolating the measured pseudoequivalent widths in these diagrams
at the observed (B-V)0. The distribution of [Fe/H] found for the BHB
stars in this way is very similar to that which we found for the RR
Lyrae stars in the same fields using the Preston AS method. The space
densities of these BHB stars were analyzed both separately and
together with earlier observations of field BHB stars given by Arnold
& Gilmore (1992MNRAS.257..225A 1992MNRAS.257..225A), Sommer-Larsen & Christensen
(1986MNRAS.219..537S 1986MNRAS.219..537S), and Preston et al. (1991ApJ...375..121P 1991ApJ...375..121P). This
analysis supports a two-component model for the halo of our Galaxy
that is similar in many respects to that proposed by Hartwick [The
Galaxy (Reidel, Dordrecht 1987)] although our discussion refers only
to the region outside the solar circle. For Z≥35kpc, a classical
spherical halo dominates which follows a Rgal-3.5 space-density
law and which has a HB morphology like that of the globular cluster M3
(i.e., approximately equal numbers of BHB and RR Lyrae stars). Closer
to the galactic plane, there is an additional component with a much
flatter galactic distribution (scale height ∼2.2kpc near the Sun). The
stars of the two components do not have significantly different
metallicity distributions but do have slightly different distributions
of the A parameter which measures the steepness of the Balmer jump;
this is the only physical criterion (independent of spatial or
kinematic considerations) which distinguishes between the two
components. If present estimates of the local RR Lyrae star space
density are correct, then the ratio of BHB stars to RR Lyrae stars is
higher in the flatter halo component. The flat component would then
have a bluer HB morphology (which could be interpreted as making it
older) than the spherical component. In the solar neighborhood about
80 percent of the BHB stars come from the flat component and about 20
percent from the spherical component. More than half of the AF stars
with V>13.0 and (B-V)0<+0.23 are not BHB stars but have surface
gravities that are more like those expected for main sequence stars.
Their measured metallicities lie in the range -0.2<[Fe/H]←2.3. The
more metal-poor of these stars are probably similar to the blue
metal-poor stars that have been discussed by Preston et al.
(1994AJ....108..538P 1994AJ....108..538P) which, while they probably include globular
cluster blue stragglers as a subset, must also comprise stars of other
types.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 72 112 SA 57 field stars identifications and positions
table2.dat 72 104 RR7 field stars identifications and positions
table3.dat 65 82 SA 57 photoelectric and spectrophotometric data
table4.dat 90 95 RR 7 Photoelectric and spectrophotometric data
table5.dat 83 61 SA 57 spectroscopic data
table6.dat 83 73 RR 7 spectroscopic data
table8.dat 67 57 RR 7 stars with (B-V)0≤0.23 classification
table7.dat 67 40 SA 57 stars with (B-V)0≤0.23 classification
tablea16.dat 93 25 Comparison of the photoelectric data with those
of other observers for stars in SA 57 field
tablea17.dat 93 39 Photoelectric and spectrophotometric data for
selected stars in the Pleiades
tablea18.dat 59 13 Photoelectric and spectrophotometric data for
selected stars in the Coma Berenices cluster
tablea19.dat 58 18 Photoelectric and spectrophotometric data for
selected field horizontal branch stars.
tablea21.dat 58 13 Photoelectric and spectrophotometric data for
selected globular cluster horizontal branch stars
tablea30.dat 73 28 Pleiades selected stars spectroscopic data
tablea31.dat 73 13 Coma Berenices cluster selected stars
spectroscopic data
tablea32.dat 95 7 Field horizontal branch stars spectroscopic data
tablea33.dat 94 13 Globular cluster horizontal branch stars
spectroscopic data
tablea34.dat 53 25 Velocity standards and multiple velocity
observations
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Sequential number
5- 19 A15 --- Case Case identification (1)
22- 45 A24 --- OtherID Other identifications (2)
47- 50 F4.1 mag Vmag V magnitude
51 A1 --- n_Vmag [:v)] v: variable; : and ): uncertainty flag
53- 54 I2 h RAh Right ascension (1950)
56- 57 I2 min RAm Right ascension (1950)
59- 62 F4.1 s RAs Right ascension (1950)
64 A1 --- DE- Declination sign
65- 66 I2 deg DEd Declination (1950)
68- 69 I2 arcmin DEm Declination (1950)
71- 72 I2 arcsec DEs Declination (1950)
--------------------------------------------------------------------------------
Note (1): The references are:
AF: Sanduleak (1988ApJS...66..309S 1988ApJS...66..309S), (Nos. 152 to 182 in table1).
AF: MacConnell et al. (1993ApJS...86..453M 1993ApJS...86..453M), Nos. 820 to 902 in table1
AF: Pesch & Sanduleak (1989ApJS...71..549P 1989ApJS...71..549P), Nos. 211 to 322 in table2
SAF: Sanduleak (private communication).
Note (2): the acronyms are:
GSC: Space Telescope Guide Star Catalog (Cat. I/220)
AGDP: Philip (1987, in IAU Colloquim No. 95, p.509).
BF: Beckers and Fenkart (1976, Photometric catalogue for Stars in
Selected Areas).
C: Croswell at al., (1991AJ....101.2078C 1991AJ....101.2078C)
CBS: Sanduleak (1990ApJS...72..291S 1990ApJS...72..291S).
DAO9: Hill (1982PDAO...16...87H 1982PDAO...16...87H).
DAO10: Hill, Barnes and Hilditch (1982PDAO...16..111H 1982PDAO...16..111H).
DAO17: Hill et al. (1988PDAO...17..297H 1988PDAO...17..297H)
DB: Doinides and Beers (1991, Cat. J/PASP/103/973).
F: Feige (1958ApJ...128..267F 1958ApJ...128..267F).
HS: Steppe (1978A&AS...31..209S 1978A&AS...31..209S).
HZ: Humason and Zwicky (1947ApJ...105...85H 1947ApJ...105...85H);
Zwicky (1965ApJ...142.1293Z 1965ApJ...142.1293Z).
KUV: Noguchi, Maehara and Kondo (1980AnTok..18...55N 1980AnTok..18...55N);
Kondo et al. (1984AnTok..20..130K 1984AnTok..20..130K).
NSV: Kholopov (1982, See Cat. II/140)
PB: Berger and Fringant (1977A&AS...28..123B 1977A&AS...28..123B).
PC: Blanco, Demers, Douglass and Fitzgerald (1968, Cat. II/4).
PG: Green, Schmidt and Liebert (1986ApJS...61..305G 1986ApJS...61..305G)
SCC: Sommer-Larsen, Christensen and Carter (1989MNRAS.238..225S 1989MNRAS.238..225S)
SI: Stobie & Ishida (1987AJ.....93..624S 1987AJ.....93..624S); Stobie (1990, priv. com).
SS: Slettebak and Stock (1959AAHam...5..105S 1959AAHam...5..105S).
TON: Iriarte and Chavira (1957BOTT....2p...3I 1957BOTT....2p...3I);
Chavira (1959BOTT....2r...3C 1959BOTT....2r...3C).
U: Usher (1981ApJS...46..117U 1981ApJS...46..117U)
USM: Usher and Mitchell (1982ApJS...49...27U 1982ApJS...49...27U).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Sequential number
5- 9 F5.2 mag Vmag V magnitude
10 A1 --- n_Vmag [v:] v: variable, ':' uncertainty flag
11- 16 F6.3 mag B-V ? B-V colour index
19- 23 F5.3 mag (u-B)K ? (u-B)K colour index
25- 28 F4.2 mag DBmag ? Amplitude variation in B wavelength
30- 34 A5 --- n,m ? Local standards (1)
35 A1 --- n_n,m [S] S = standard
37- 42 F6.3 --- PCG ? Pseudo-continuum gradient (2)
45- 50 F6.3 mag BJA ? Difference between bandpass 1 and bandpass 2
53- 57 F5.1 0.1nm lambda0.5 ? Wavelength of mean fluxes F1 and F2 (3)
60- 65 F6.3 --- LAMBDA ? BHB star discriminant (4)
--------------------------------------------------------------------------------
Note (1): Landolt standards were observed at the beginning, middle, and end
of each night. In addition, local standards in both SA 57 and RR 7
were observed on roughly an hourly basis in order to monitor the
transparency. These local standards (9≤V≤10) also served as the
primary standards of the (u-B) system, hereafter denoted by (u-B)K.
Note (2): PCG is the slope of a linear relation through bandpass 3, 4, 5 and 6.
Note (3): F0.5 is the mean of the fluxes F1 and F2 measured on either side of
the Balmer discontinuity in bandpass 1 and 2, respectively. The
wavelength (corrected for radial velocity) at which the envelope to
the spectrum has this flux defines lambda0.5. For convenience, we
subtract 3700 from the measured wavelength in the quoted value of
lambda0.5.
The importance of this parameter is that it measures the steepness of
the Balmer jump (the smaller lambda0.5, the steeper the jump).
Note (4): Stars with negative value of LAMBDA are main sequence stars and those
with positive values are horizontal branch stars.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Sequential number
5- 9 F5.2 mag Vmag V magnitude
10 A1 --- n_Vmag [v] v: Variability
12- 17 F6.3 mag B-V B-V colour index
19- 23 F5.3 mag (u-B)K ? (u-B)K colour index
25- 28 F4.2 mag DBmag ? Amplitude variation in B wavelength
30- 35 A6 --- n,m ? Local standard (1)
36 A1 --- n_n,m [S] S: standard
38- 43 F6.3 mag (B-V)0 Dereddened B-V colour index
45- 50 F6.3 mag (u-B)K0 ? Dereddened (u-B)K colour index
52- 57 F6.3 --- PCG ? Pseudo-continuum gradient
59- 64 F6.3 mag BJA ? Difference between bandpass 1 and bandpass 2
66- 71 F6.3 --- PCG0 ? Dereddened pseudo-continuum gradient
73- 78 F6.3 mag BJA0 ? Dereddened BJA
80- 83 F4.1 0.1nm lambda0.5 ? Wavelength of mean fluxes (as in table3)
85- 90 F6.3 --- LAMBDA ? BHB star discriminant
--------------------------------------------------------------------------------
Note (1): Landolt standards were observed at the beginning, middle, and end
of each night. In addition, local standards in both SA 57 and RR 7
were observed on roughly an hourly basis in order to monitor the
transparency. These local standards (9≤V≤10) also served as the
primary standards of the (u-B) system, hereafter denoted by (u-B)K.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Identification numbers from Tables 1 and 2
4 A1 --- n_Seq [*] *: horizontal branch star
5- 9 F5.2 mag Vmag V magnitude
10 A1 --- n_Vmag [:v] v: variable, ':' Uncertainty flag
11- 16 F6.3 mag (B-V)0 ? Dereddened B-V colour index
18- 22 F5.2 0.1nm EWH Mean equivalent width of Hγ and Hδ
as defined in text.
24- 28 F5.3 mag beta Photometric index beta derived from EWH
(see text).
30- 33 F4.1 0.1nm D0.2 ? Mean width of Hγ and Hδ at 20%
of continuum level.
35- 39 F5.2 0.1nm EWCa Equivalent width of Ca II K-line as defined
in text.
41- 45 F5.3 0.1nm EWFe ? Equivalent width of Fe I lambda 4272 line.
46 A1 --- u_EWFe Uncertainty flag
48- 52 F5.3 0.1nm EWMg ? Equivalent width of MgII lambda 4481 line.
53 A1 --- u_EWMg Uncertainty flag on EWMg
55- 58 F4.1 [Sun] [Fe/H]Ca ? Abundance derived from EWca.
59 A1 --- u_[Fe/H]Ca Uncertainty flag on [Fe/H]Ca
60- 61 A2 --- l_[Fe/H]Fe [≤] Limit flag on [Fe/H]Fe
62- 65 F4.1 [Sun] [Fe/H]Fe ? Abundance derived from EWFe.
66 A1 --- u_[Fe/H]Fe Uncertainty flag on [Fe/H]Fe
68- 71 F4.1 [Sun] [Fe/H]Mg ? Abundance derived from EWMg.
72 A1 --- u_[Fe/H]Mg Uncertainty flag on [Fe/H]Mg
74- 77 F4.1 [Sun] [Fe/H]m Mean of abundances [Fe/H]Ca ,[Fe/H]Fe and
[Fe/H]Mg
78 A1 --- u_[Fe/H]m Uncertainty flag on [Fe/H]m
80- 83 I4 km/s RV Radial velocity
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Sequential number
5- 9 F5.2 mag V0 Dereddened V magnitude
11- 16 F6.3 mag (B-V)0 Dereddened B-V colour index
18- 20 A3 --- C(u-B)K BHB criteria from (u-B)K (1)
22- 24 A3 --- CLAMBDA BHB criteria from LAMBDA (1)
26- 28 A3 --- CD0.2 BHB criteria from D0.2 (1)
30- 33 A4 --- Class Adopted class
34 A1 --- n_Class [a] a: probably variable. See Sect.5.1.1.
36- 39 F4.1 [Sun] [Fe/H] ? Metallicity
40 A1 --- u_[Fe/H] Uncertainty flag on [Fe/H]
42- 45 I4 km/s RV ? Radial velocity
47- 51 F5.2 mag VMag Absolute visual magnitude
52 A1 --- n_VMag [*] Note on the calculation of VMag (2)
54- 57 F4.1 kpc Dist Distance
59- 62 F4.1 kpc Z Distance above the galactic plane
64- 67 F4.1 kpc Rg Distance from the galactic center
--------------------------------------------------------------------------------
Note (1): The classification, in BHB or class A(non-BHB), is based on
three criteria:
(1) Is the star in the BHB location in the
(u-B)K vs (B-V)0 diagram?
(2) Is the spectrophotometric parameter LAMBDA positive?
(3) Is the star in the BHB location in the
{DELTA}(D0.2) vs [Fe/H] diagram?
? indicates an uncertainty
Note (2): Absolute V magnitude was calculated with the relation:
Mv=1.32 + 4.05(B-V)0 - 0.45[Fe/H]
* indicates that the absolute V magnitude was calculated with the
relation: Mv= 0.79 + 5.24(B-V)0
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea16.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Sequential number
4- 9 A6 --- n_Seq Note
11- 15 F5.2 mag Vmag V magnitude (this paper)
17- 22 F6.3 mag B-V B-V colour index (this paper)
24- 29 F6.3 mag (u-B)K ? (u-B)K colour index (this paper)
31- 35 F5.2 mag VmagH ? V magnitude (Harris & Upgren, 1964) (1)
37- 41 F5.2 mag B-VH ? B-V colour index (Harris & Upgren, 1964) (1)
43- 47 F5.2 mag U-BH ? U-B colour index (Harris & Upgren, 1964) (1)
49- 53 F5.2 mag VmagD ? V magnitude (Doinides & Beers, 1991) (2)
55- 59 F5.2 mag B-VD ? B-V colour index (Doinides & Beers, 1991) (2)
61- 65 F5.2 mag U-BD ? U-B colour index (Doinides & Beers, 1991) (2)
68- 72 F5.2 mag VmagHB ? V magnitude (Hill et al., 1982) (3)
74- 79 F6.3 mag b-yHB ? b-y colour index (Hill et al., 1982) (3)
81- 86 F6.3 mag m1HB ? m1 colour index (Hill et al., 1982) (3)
88- 93 F6.3 mag c1HB ? c1 colour index (Hill et al., 1982) (3)
--------------------------------------------------------------------------------
Note (1): Data from Harris & Upgren, 1964ApJ...140..151H 1964ApJ...140..151H
Note (2): Data from Doinides & Beers, 1991, Cat. J/PASP/103/973
Note (3): Data from Hill, Barnes & Hilditch, 1982PDAO...12..111H 1982PDAO...12..111H
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea17.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Hz(ii) Hertzsprung (1947AnLei..19a...1H 1947AnLei..19a...1H) number
7- 11 I5 --- HD ? HD number
13- 18 A6 --- SpType Spectral type
20- 25 F6.3 mag E(B-V) B-V reddening
26 A1 --- u_E(B-V) [)] Uncertainty flag on E(B-V)
27- 32 F6.3 mag B-V B-V colour index
34- 38 F5.3 mag (u-B)K ? (u-B)K colour index
41- 46 F6.3 mag (B-V)0 Dereddened B-V colour index
47 A1 --- u_(B-V)0 [)] Uncertainty flag on (B-V)0
49- 53 F5.3 mag (u-B)K0 ? Dereddened (u-B)K colour index
54 A1 --- u_(u-B)K0 [)] Uncertainty flag on (u-B)K0
55- 60 F6.3 --- PCG ? Pseudo-continuum gradient
62- 67 F6.3 mag BJA ? Difference between bandpass 1 and bandpass 2
69- 74 F6.3 --- PCG0 ? Dereddened PCG
76- 81 F6.3 mag BJA0 ? Dereddened BJA
84- 87 F4.1 0.1nm lambda0.5 ? Wavelength of F0.5 (see table3)
89- 93 F5.2 --- LAMBDA ? BHB star discriminant
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea18.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Tr Trumpler (1938LicOB..18..167T 1938LicOB..18..167T) number
5- 10 I6 --- HD HD number
12- 15 A4 --- SpType Spectral type
17- 22 F6.3 mag B-V B-V colour index
24- 29 F6.3 --- PCG Pseudo-continuum gradient
31- 36 F6.3 --- BJA Difference between bandpass 1 and bandpass 2
38- 41 F4.1 0.1nm lambda0.5 ? Wavelength of F0.5 (see table3)
43- 48 F6.3 --- LAMBDA ? BHB star discriminant
49 A1 --- n_LAMBDA [b] Note (1)
50- 58 A9 --- Notes Notes
59 A1 --- n_Notes [a] Note (1)
--------------------------------------------------------------------------------
Note (1): Individual notes:
a: Abt and Levato (1977PASP...89...29A 1977PASP...89...29A) give F5 V.
b: Abt and Levato (1977PASP...89...29A 1977PASP...89...29A) give Am (K/H/M= A3/A7/A7).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea19.dat tablea21.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- ID Identification (1)
11 A1 --- n_ID Note on ID (3)
13- 17 F5.3 mag E(B-V) Redenning (2)
19- 24 F6.3 mag (B-V)0 Dereddening B-V colour index (4)
26- 30 F5.3 mag (u-B)K ? (u-B)K colour index
32- 33 I2 --- N ? Number of observations
35- 40 F6.3 --- PCG0 ? Dereddened PCG
42- 46 F5.3 mag BJA0 ? Dereddened BJA
48- 51 F4.1 0.1nm lambda0.5 ? Wavelength of F0.5 (see table3)
53- 58 F6.3 --- LAMBDA ? BHB star discriminant
--------------------------------------------------------------------------------
Note (1): In tablea21: from Sandage and Walker (1966ApJ...143..313S 1966ApJ...143..313S);
S-stars from Sanduleak (1989ApJS...71..713S 1989ApJS...71..713S)
Note (2): From Sandage (1969ApJ...157..515S 1969ApJ...157..515S) in tablea21
Note (3): the symbols have the following meaning:
a: Possibly not an FHB star (Philip and Adelman, 1991PASP..103...63P 1991PASP..103...63P)
b: Variable. See Sect.18 and Table A15.
c: Philip (1984CoVVO...2....1P 1984CoVVO...2....1P)
d: Slettebak and Stock (1959AAHam...5..105S 1959AAHam...5..105S)
e: No longer considered to be an FHB star (Philip and Adelman,
1991PASP..103...63P 1991PASP..103...63P)
f: Star has companion 7 arcsec to North
Note (4): In tablea21: from Sandage (1969ApJ...157..515S 1969ApJ...157..515S);
CCD photometry (this paper) for S-stars
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea3[0123].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- ID Identification (1)
12- 17 I6 --- HD ? HD number
18 A1 --- n_ID Note (2)
20- 25 F6.3 mag (B-V)0 Dereddened B-V colour index
27- 31 F5.2 0.1nm EWH ? Mean equivalent width of Hγ & Hδ
32 A1 --- n_EWH [v] v: variable
33- 37 F5.3 mag beta ? Calculated photometric index beta
38 A1 --- n_beta [v] v: variable
39- 43 F5.3 mag beta1 ? Phometric index beta literature (3)
45- 49 F5.3 mag beta2 ? Phometric index beta from Stetson
(1991AJ....102..589S 1991AJ....102..589S)
52- 55 F4.1 0.1nm D0.2 ? Mean width of Hγ and Hδ at 20%
of continuum level
56 A1 --- n_D0.2 [v] v: variable
57- 61 F5.2 0.1nm EWCa ? Equivalent width of Ca II A3933
62 A1 --- n_EWCa [v] v: variable
63- 67 F5.3 0.1nm EWFe ? Equivalent width of Fe I A4272
68 A1 --- n_EWFe [v] v: variable
69- 73 F5.3 0.1nm EWMg ? Equivalent width of Mg II A4481
74 A1 --- n_EWMg [v] v: variable
75- 79 F5.2 [Sun] [Fe/H] ? Abundance assumed for calibration (see text)
81- 84 F4.1 [Sun] [Fe/H]Ca ? Abundance derived from the Ca line
85 A1 --- n_[Fe/H]Ca [v] v: variable
86- 89 F4.1 [Sun] [Fe/H]Fe ? Abundance derived from the Fe line
90 A1 --- n_[Fe/H]Fe [v] v: variable
91- 94 F4.1 [Sun] [Fe/H]Mg ? Abundance derived from the Mg line
95 A1 --- n_[Fe/H]Mg [v] v: variable
--------------------------------------------------------------------------------
Note (1): In tableA30; Hertzsprung (1947AnLei..19a...1H 1947AnLei..19a...1H) number
In tablea31: Trumpler (1938LicOB..18..167T 1938LicOB..18..167T) number
In tablea33, From Sandage and Walker (1966ApJ...143..313S 1966ApJ...143..313S);
S-stars from Sanduleak (1989ApJS...71..713S 1989ApJS...71..713S)
Note (2): the symbols have the following meaning:
g: Possibly not an FHB star (Philip and Adelman 1991PASP..103...63P 1991PASP..103...63P)
h: Variable. See Sect.18 and Table A29
i: Star has companion 7 arcsec to North
Note (3): tablea30: Crawford and Perry (1976AJ.....81..419C 1976AJ.....81..419C)
tablea31: Crawford and Barnes (1969AJ.....74..407C 1969AJ.....74..407C)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea34.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Group Group (1)
7- 22 A16 --- Object Object name
26- 31 F6.1 km/s Mean velocity
35- 38 F4.1 km/s e_ ? rms uncertainty on
40- 41 I2 --- Nobs Number of observations
45- 50 F6.1 km/s vpub ? Published velocity
53 I1 --- r_vpub ? Reference for vpub (2)
--------------------------------------------------------------------------------
Note (1): the group is defined by:
Std: standard;
GC: globular cluster;
Misc: Miscllaneous;
PG: Program stars (with more than one observation)
Note (2): the reference numbers are:
1: Green and Morrison (1993, in The Globular Cluster-Galaxy
Connection, ASP Conf. p. 318));
2: Kraft (1965ApJ...142..681K 1965ApJ...142..681K);
3: Pearce & Hill (1975PDAO...14..319P 1975PDAO...14..319P);
4: Pier (1983ApJS...53..791P 1983ApJS...53..791P);
5: Webbink (1985IAUS..113..541W 1985IAUS..113..541W);
6: Carney & Latham (1986AJ.....92...60C 1986AJ.....92...60C)
--------------------------------------------------------------------------------
Table A15: The space densities of the BHB stars derived from nine polar fields
of the HK survey (Preston, Schectman and Beers, 1991ApJS...76.1001P 1991ApJS...76.1001P)
------------------------------------------------------------------------------
Range in | Range in |Number| Volume | Space density of BHB | Mean value
Distance | V mag |of BHB| | rho rhohalo rhoflat | Z Rgal
(kpc) | |stars |(kpc3)| (kpc3) | (kpc)
(1) | (2) | (3) | (4) | (5) (6) (7) | (8) (9)
------------------------------------------------------------------------------
1.128-1.787| 11.00-12.00| 2.5 | 0.0976 | 25.62 5.87 19.75 | 1.48 8.15
1.787-3.649| 12.00-13.55| 13.5 | 0.984 | 13.72 5.15 8.57 | 2.56 8.46
3.649-4.489| 13.55-14.00| 8.5 | 0.960 | 8.85 4.47 4.38 | 4.03 8.81
4.489-5.652| 14.00-14.50| 14.0 | 2.052 | 6.82 5.07 1.75 | 4.91 8.50
5.652-6.488| 14.50-14.80| 7.0 | 2.115 | 3.31 2.85 0.46 | 6.06 10.01
6.488-7.114| 14.80-15.00| 8.0 | 1.989 | 4.02 2.22 1.80 | 6.86 10.77
------------------------------------------------------------------------------
Notes: rho: Total Space Density derived from (3) and (4)
rhohalo: Space Density of the Spherical Halo computed from eq. (12)
rhoflat: Space Density of the Flat Halo obtained by subtracting (6) from (5)
------------------------------------------------------------------------------
Table A20: Photoelectric data for blue stragglers in the open cluster
-------------------------------------------------------------------
Fagerhom Sanders Spectral (B-V)0 (u-B)K0 v sin i
number number type (km/s)
-------------------------------------------------------------------
55 752 Am +0.251 1.963 70
153 968 Am +0.094 1.915 <10
81 977 B8 V -0.107 1.283
156 1066 A2 V +0.061 1.915 70
131 1082 F0 IV +0.376 1.796 30
185 1263 (A4) +0.187 1.982 *
238 1267 (A3) +0.185 1.992 *
184 1280 (F0) +0.218 1.834 80
190 1284 A8 IV-V +0.207 1.955 65
280 1434 A3 V +0.074 1.943 120
-------------------------------------------------------------------
Notes: vsini is from compilation by Mathys (1991A&A...245..467M 1991A&A...245..467M).
*: "rotating rather slowly (specially F 185)"
(Mathys,1991A&A...245..467M 1991A&A...245..467M)
-------------------------------------------------------------------
Table A22: Photoelectric observations of Am and Ap stars.
----------------------------------------------------------------
BD No Renson Spectal V (B-V)0 (u-B)K E(B-V)
type
----------------------------------------------------------------
+44 2627 43282 A2,F0 9.34 +0.220 1.902 0.00
+01 3456 44810 Sr,Cr,Eu 10.33b +0.357 1.907 0.18
+46 2352 45380 A3,F0 8.89 +0.224 1.826 0.03
+30 3045 45400 A0,- 8.47 +0.188 1.895 0.05
+05 3473 45480 A1,A7 9.36 +0.140 1.874 0.15
+45 2590 45590 A2,F2 9.83c +0.312 1.870 0.03
+28 2830 45710 A2,A9 8.05 +0.080 1.890 0.06
-----------------------------------------------------------------
Notes: Catalogue of P. Renson (1991, Cat. III/162)
b: Fainter than Catalogue magnitude (9.3).
c: Brighter than Catalogue magnitude (10.5)
d: From charts of Burstein & Heiles (1982AJ.....87.1165B 1982AJ.....87.1165B)
-----------------------------------------------------------------
Table A23: Error (e_Bmag) of a single observation of a p.e. B magnitude
as a function of V magnitude.
-----------------------------------------------------------------------
Range in V RR 4 (SA 57) RR 7 Both fields
magnitude Nstar e_Bmag Nstar e_Bmag Nstar e_Bmag
-----------------------------------------------------------------------
V < 13 17 0.016 22 0.018 39 0.017
13 < V < 14 8 0.023 8 0.022 16 0.023
14 < V < 15 15 0.024 14 0.014 29 0.019
15 < V < 16 16 0.033 28 0.029 44 0.030
16 < V < 17 12 0.045 10 0.037 22 0.041
-----------------------------------------------------------------------
Table A24: Spectrophotometric wavebands.
---------------------------------------------------------------
Wavelength Central Bandwith Extinction
number wavelength
(0.1nm) (0.1nm) (mag)
---------------------------------------------------------------
1 3612 125 1.370
2 23857 25 1.066
3 34030 40 0.872
4 44168 55 0.708
5 54230 70 0 641
6 64442 105 0.436
---------------------------------------------------------------
Note: Extinction at this wavelength relative to that at 4861A
if E(B-V) = 1.000 magnitudes.
---------------------------------------------------------------
Table A25: The errors in the spectrophotometric parameters
BJA, PCG, and lambda0.5.
-------------------------------------------------------------------------------
| BJA | PCG | lambda0.5
Star Nobs| Mean rms rmsR | Mean rms rmsR | Mean rms rmsR
| value | value | value
-------------------------------------------------------------------------------
HD 60778 | 9| 1.373 0.019 0.020 | -0.115 0.052 0.064 | 60.2 1.7 1.6
HD 74721 | 12| 1.339 0.006 0.006 | -0.289 0.012 0.014 | 60.3 1.3 1.2
HD 86986 | 11| 1.334 0.009 0.008 | -0.131 0.033 0.028 | 58.2 2.2 1.9
HD 109995 | 13| 1.365 0.004 0.004 | -0.244 0.026 0.025 | 60.1 0.8 0.6
HD 161817 | 10| 1.288 0.006 0.007 | -0.013 0.054 0.060 | 57.8 1.5 1.5
BD+08 0578 | 3| 1.340 0.012 0.014 | -0.119 0.008 0.009 | 57.2 1.4 1.6
HD 64488 | 8| 1.274 0.005 0.005 | -0.286 0.016 0.014 | 64.5 0.4 0.4
RR 4 No. 22 | 10| 0.851 0.005 0.005 | +0.495 0.026 0.028 | 64.7 1.5 1.4
RR 7 No.103 | 6| 1.080 0.008 0.004 | -0.229 0.034 0.025 | 71.0 0.7 0.6
Program Stars b | 10| 0.007 | 0.020 | 2.0
-------------------------------------------------------------------------------
Note on Program Stars : Stars No. 6, 7 and 89 in RR 4 and
Stars No. 3 and 36 in RR 7.
-------------------------------------------------------------------------------
Table A26: Wavebands used for measurement of equivalent widths
of Hδ and Hγ
-----------------------------------------------------------------------------
Line Red continuum waveband Line waveband Blue continuum waveband
-----------------------------------------------------------------------------
Hδ 4140 to 4220 4087 to 4115 4000 to 4048
Hγ 4378 to 4478 4325 to 4355 4200 to 4265
-----------------------------------------------------------------------------
Table A27: Metallicity determinations for selected field horizontal branch stars
-------------------------------------------------------------------------------
Star | [Fe/H] from literature | Adopted | [Fe/H]out
|Danford K&P A&P C+ | [Fe/H] |[Fe/H]Mg [Fe/H]Ca [Fe/H]Fe
----------------------------------------------------|--------------------------
HD 2857 | -1.4 -1.5 |-1.65 d | -1.5 -1.7 -1.6
HD 14829 | -1.8 |-2.2 d | -2.0
HD 60778 f| -1.0 -1.3 |-1.4 d | -1.4 -1.6 -1.6
HD 74721 | -1.1 -1.2 -1.7 -1.0 |-1.30±0.21e | -1.4
HD 86986 | -1.1 -1.7 -2.0 -1.5 |-1.73±0.14e | -1.7 -1.95
HD 109995 | -1.3 -1.1 -2.0 -2.0 |-1.70±0.30e | -1.65
HD 161817 g| -1.2 -2.1 -1.7 -1.5 |-1.77±0.17e | -1.9 -1.4 -1.6
------------------------------------------------------------------------------
Notes: Danford: Danford, 1976, Ph.D. thesis, Yale University
K&P: Klochkova and Panchuk (1988AISAO..26...27K 1988AISAO..26...27K).
A&P: Adelman and Philip (1992MNRAS.254..539A 1992MNRAS.254..539A)
C+: Cacciari et al. (1987A&A...183..314C 1987A&A...183..314C)
d: Mean of cols. 2 and 3 with value in col. 2 reduced by 0.4 dex.
e: Mean of cols. 3, 4 and 5.
f: Possibly not an FHB star (Philip and Adelman, 1991PASP..103...63P 1991PASP..103...63P)
g: Variable. See Sect. 18 and Table A29
-------------------------------------------------------------------------------
Table A28: Comparison of the present K-line calibration with that of
Preston et al. (1991ApJ...375..121P 1991ApJ...375..121P)
-----------------------------------------------------------------------
(B-V)0 [Fe/H]
Preston et al. Present work
-----------------------------------------------------------------------
0.05 0.0 -1.0 -2.0 +0.1 -1.1 -2.5
0.10 0.0 -1.0 -2.0 +0.2 -1.1 -2.4
0.15 0.0 -1.0 -2.0 +0.2 -1.2 -2.4
0.20 0.0 -1.0 -2.0 +0.2 -1.25 -2.4
-----------------------------------------------------------------------
Table A29: HD 161817 and HD 109995: Comparison of the spectrum of 1989 Jan 30 UT
with the mean of eight later spectra.
-------------------------------------------------------------
D0.2 BJA PCG EWH EWCa EWMg
-----------------------------------------------------------------------
HD 161817
Mean Value 31.8 1.291 -0.029 9.65 1.86 0.23
sigma 0.6 0.004 +0.029 +0.08 0.03 0.02
delta -0.7 -0.017 +0.152 -1.69 -0.27 -0.04
HD 109995
Mean Value 33.4 1.365 -0.240 11.92 0.70 0.23
sigma 0.6 0.003 +0.023 0.02 0.02 0.03
delta 0.0 +0.009 -0.053 0.00 -0.02 -0.01
-----------------------------------------------------------------------
Notes: EWH, EWCa and EWMg are the equivalent widths of the mean of
Hδ and Hγ, the K-line and the 4481Å line
respectively.
Mean value: mean values for the nights of 1989 Mar 31,
Apr 1, 2, 3 and 4, and 1990 Apr 26, 27 and 28. (UT)
sigma: rms deviation of the value for a single night from the mean.
delta: difference between value for night of 1989 Jan 30 and
the mean value
-----------------------------------------------------------------------
Table 35: the accuracy of the radial velocity zero-points.
----------------------------------------------------------
Run No. v(published)-v(thispaper) sigma N mean error
(km/s) (km/s) (km/s)
----------------------------------------------------------
1 -1.5 ±15.3 12 3.5
2 -1.6 ±15.7 45 2.3
3 -1.7 ±25.4 12 7.3
4 +1.5 ±20.8 36 3.5
----------------------------------------------------------
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 26-Jun-1997