J/A+A/422/527 Metal-poor star uvby-beta photometry. X. (Schuster+, 2004)
uvby-beta photometry of high-velocity and metal-poor stars.
X. Stars of very low metal abundance: observations, reddenings, metallicities,
classifications, distances, and relative ages.
Schuster W.J., Beers T.C., Michel R., Nissen P.E., Garcia G.
<Astron. Astrophys. 422, 527 (2004)>
=2004A&A...422..527S 2004A&A...422..527S
ADC_Keywords: Stars, high-velocity ; Stars, metal-deficient ;
Photometry, uvby, beta ; Abundances, [Fe/H]
Keywords: stars: abundances - stars: distances - stars: fundamental parameters -
ISM: dust, extinction - Galaxy: evolution - Galaxy: halo
Abstract:
(uvby) and H-beta photometry has been obtained for an additional 411
very metal-poor stars selected from the HK survey, and used to derive
basic parameters such as interstellar reddenings, metallicities,
photometric classifications, distances, and relative ages.
Description:
Table 1 lists the Stroemgren (uvby) and H-beta photometry observed at
the San Pedro Martir observatory, Mexico, plus the number of
independent uvby and H-beta observations and Notes concerning the
observing conditions, stellar types, and photometric variability.
Table 2 contains the Stroemgren (uvby) photometry observed at the La
Silla, Chile, observatory, plus the number of independent uvby
observations and Notes concerning possible photometric variability.
Table 3 gives a list of the 497 very metal poor stars with their
positions, both equatorial and Galactic; broadband V and B-V
photometry, where available; the reddenings in the stellar directions
obtained by interpolation in the maps of Schlegel, Finkbeiner, & Davis
(1998ApJ...500..525S 1998ApJ...500..525S); our final adopted reddening according to Eq. 1;
the resulting dereddened B-V; also B-V dereddened according to the
intrinsic-color calibration of Schuster & Nissen (1989, Cat.
II/180); and finally asterisks in the final two columns which
indicate the stars that are CH-star candidates according to Fig. 5,
and those that are photometric outliers as seen in Figs. 1 and 4,
respectively.
Table 4 contains the cross-identifications for a number of the very
metal poor stars; these are stars identified as very-metal-poor in
more than one of the overlapping fields from the HK survey.
Table 5 gives the dereddened values V0, (b-y)0, m0, and c0 for
our uvby photometry, the reddening excesses for (b-y) and (B-V), and
the photometric classification according to our c0,(b-y)0 diagram,
Fig. 6.
Table 6 shows the line-strength indices from the HK survey. KP is the
index that measures the strength of the CaII K line; HP2 and HG2
measure the strengths of the Balmer lines H-delta and H-gamma,
respectively; GP measures the strength of the CH G-band.
Table 7 lists the [Fe/H] values from our different calibration
procedures with the adopted mean in column 6 and Notes in column 7.
Table 8 contains observed and derived quantities for the probable
metal-rich BS (Am) stars.
Table 9 gives the photometric absolute magnitudes and stellar
distances for the 497 very-metal-poor stars; stellar distances are
given from both the BV and uvby photometries.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 245 uvby-β data from SPM
table2.dat 50 177 uvby data from La Silla
table3.dat 83 497 Coordinates, BV photometry, reddening excesses,
(B-V)0's, and Notes
table4.dat 31 53 Cross-Identifications of VMP Stars
table5.dat 61 508 Dereddened photometry, Reddening Excesses,
and Photometric Classifications
table6.dat 31 497 Line-strength indices from the HK survey
table7.dat 41 497 [Fe/H] values from different methods,
plus adopted average
table8a.dat 68 10 Metal-rich BS (Am) stars - observed quantities
table8b.dat 59 10 Metal-rich BS (Am) stars - derived quantities
table9.dat 69 497 Photometric absolute magnitudes and distances
of the VMP stars
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See also:
II/180 : Metal-poor stars uvby-beta photometry. III. (Schuster+ 1989)
J/A+AS/97/951 : Metal-poor stars uvby-beta photometry. VI. (Schuster+ 1993)
J/A+AS/117/317 : Metal-poor stars uvby-beta photometry. VIII. (Schuster+ 1996)
J/A+A/445/939 : Metal-poor stars uvby-beta photometry. XI. (Schuster+, 2006)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star designation
11- 16 F6.3 mag Vmag ? Johnson V magnitude
18- 23 F6.3 mag b-y Stroemgren colour index b-y
25- 30 F6.3 mag m1 Stroemgren metallicity index m1
32- 37 F6.3 mag c1 Stroemgren Balmer discontinuity index c1
39 I1 --- o_b-y Number of independent observations in uvby
41- 45 F5.3 mag Hbeta ? Hβ line index
47 I1 --- o_Hbeta ? Number of independent observations in Hbeta
49- 78 A30 --- Notes Notes (1)
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Note (1): Notes:
V,V? = variable(?)
RG = red subgiant-giant
fnt(r) = faint(er)
st = star
os = outside
dph = diaphragm
D,D? = double(?)
wo = without
excl = exclude
obs = observation(s)
contm = contaminated
ocntr = offcenter
js = just
S = south
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 12 I2 h RAh Right ascension (J2000.0)
14- 15 I2 min RAm Right ascension (J2000.0)
17- 20 F4.1 s RAs Right ascension (J2000.0)
22 A1 --- DE- Declination sign (J2000.0)
23- 24 I2 deg DEd Declination (J2000.0)
26- 27 I2 arcmin DEm Declination (J2000.0)
29- 30 I2 arcsec DEs Declination (J2000.0)
32- 36 F5.1 deg GLON Galactic longitude
38- 42 F5.1 deg GLAT Galactic latitude
44- 48 F5.2 mag Vmag ? V magnitude
50- 54 F5.2 mag B-V ? B-V colour index
56- 60 F5.2 mag E(B-V)S Interstellar reddening from Schlegel et al.,
1998ApJ...500..525S 1998ApJ...500..525S
62- 66 F5.2 mag E(B-V) Adopted interstellar reddening in (B-V)
from Eq. 1
68- 72 F5.2 mag (B-V)0 ? De-reddened Johnson color index B-V
74- 78 F5.2 mag (B-V)0b ? Estimated de-reddened Johnson color index
B-V, derived from (b-y)_0, Fig. 4
80 A1 --- CH [*] *: star is likely carbon enhanced,
from Fig. 5
83 A1 --- OUT [*] *: star is considered a photometric
outlier, from Figs. 1, 4
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
12- 20 A9 --- Name2 Second alternative name of star
23- 31 A9 --- Name3 Third alternative name of star
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 16 F6.3 mag V0 ? Visual magnitude corrected for interstellar
absorption (1)
18- 23 F6.3 mag (b-y)0 De-reddened Stroemgren color index b-y (1)
25- 30 F6.3 mag m0 De-reddened Stroemgren metallicity index m1 (1)
32- 37 F6.3 mag c0 De-reddened Stroemgren Balmer discontinuity
index c1 (1)
39- 44 F6.3 mag E(b-y) ? Stroemgren interstellar reddening estimate
from intrinsic-color calibration of
Schuster & Nissen (1989, Cat. II/180)
46- 49 F4.2 mag E(B-V) ? Adopted interstellar reddening in (B-V),
from eq. 1
51- 61 A11 --- Class Photometric classification of star, Fig.6 (G1)
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Note (1): V, b-y, m1 and c1 have been corrected for the effect of
interstellar reddening if E(b-y)≥0.015 or E(B-V)≥0.02.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 14 F4.2 0.1nm KP ? Ca II K line index
16- 20 F5.2 0.1nm HP2 ? Balmer Hδ line index
22- 26 F5.2 0.1nm HG2 ? Balmer Hγ line index
28- 31 F4.2 0.1nm GP ? CH G-band line index
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 15 F5.2 [Sun] [Fe/H]K1 ? Metallicity based on KP, (B-V)0b
(Beers et al., 1999, Cat. J/AJ/117/981)
17- 21 F5.2 [Sun] [Fe/H]A1 ? Metallicity based on KP, (B-V)0b, and an
Artificial Neural Network
23- 27 F5.2 [Sun] [Fe/H]K2 ? Metallicity based on KP, (B-V)0
(Beers et al., 1999, Cat. J/AJ/117/981)
29- 33 F5.2 [Sun] [Fe/H]A2 ? Metallicity based on KP, (B-V)0, and an
Artificial Neural Network
35- 39 F5.2 [Sun] [Fe/H] ? Final estimate of metallicity
41 I1 --- Notes [1/3]? Individual notes (1)
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Note (1): Individual notes:
1: Late-type star, CaII-K emission
2: Composite spectrum (Early + Late)
3: CD-38:245
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Byte-by-byte Description of file: table8a.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 16 F6.3 mag VJmag Johnson V magnitude
18- 22 F5.3 mag b-y Stroemgren colour index b-y
24- 28 F5.3 mag m1 Stroemgren metallicity index m1
30- 34 F5.3 mag c1 Stroemgren Balmer discontinuity index c1
36- 40 F5.3 mag Hbeta Hβ line index
42- 46 F5.3 mag [c1] Reddening-free Balmer discontinuity index
48- 52 F5.3 mag [m1] Reddening-free metallicity index
54- 58 F5.2 mag Vmag ? Johnson broad-band V magnitude
60- 63 F4.2 mag B-V ? Johnson broad-band B-V colour index
65- 68 F4.2 mag U-B ? Johnson broad-band U-B colour index
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Byte-by-byte Description of file: table8b.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 14 F4.2 mag E(B-V) Adopted interstellar reddening in (B-V)
from Eq. 1
16- 19 F4.2 mag (B-V)0 De-reddened Johnson color index B-V
20 A1 --- u_(B-V)0 [)] Uncertainty flag on (B-V)0
22- 25 F4.2 mag (U-B)0 ? De-reddened Johnson color index U-B
27- 32 F6.3 mag V0 V magnitude corrected for interstellar
absorption
34- 38 F5.3 mag (b-y)0 De-reddened Stroemgren color index b-y
40- 44 F5.3 mag m0 De-reddened Stroemgren metallicity index m1
46- 50 F5.3 mag c0 De-reddened Stroemgren Balmer discontinuity
index c1
52- 53 A2 --- Class Photometric classification of star (G1)
55- 59 F5.2 [Sun] [Fe/H] ? Final estimate of metallicity
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 21 A11 --- Class Photometric classification of star (G1)
24- 29 F6.3 mag VMAG1 ? Estimated absolute magnitude, assuming primary
classification (MS for TO stars, as listed
for others) and UBV photometry
31- 36 F6.3 mag VMAG2 ? Estimated absolute magnitude, assuming secondary
classification (SG or RG for TO stars) and UBV
photometry
38- 42 I5 pc Dist1 ? Estimated distance, assuming primary
classification (MS for TO stars, as listed for
others) and UBV photometry
44- 48 I5 pc Dist2 ? Estimated distance, assuming secondary
classification (SG or RG for TO stars) and UBV
photometry
50- 54 I5 pc Dist ? Estimated distance based on Stroemgren
photometry and indices
56- 69 A14 --- Notes Comments on individual stars
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Global Notes:
Note (G1): the photometric classes are as in Fig.6 of the paper:
TO = turnoff stars;
BS-TO = the blue-straggler-turnoff transition;
BS = blue stragglers;
MS = main sequence;
SG = subgiant stars;
RG = red giants (RG);
RHB-AGB = red-horizontal-branch asymptotic-giant-branch transition;
HB = horizontal branch;
BHB = blue horizontal branch;
SL-BHB = subluminous blue-horizontal-branch transition;
SL = subluminous (SL) stars.
Acknowledgements: William Schuster
References:
Schuster at al., Paper I 1988A&AS...73..225S 1988A&AS...73..225S
Schuster at al., Paper II 1989A&A...221...65S 1989A&A...221...65S
Schuster at al., Paper III 1989A&A...222...69S 1989A&A...222...69S, Cat. II/180
Allen et al., Paper IV 1991A&A...244..280A 1991A&A...244..280A
Nissen et al., Paper V 1991A&A...251..457N 1991A&A...251..457N
Schuster et al. Paper VI 1993A&AS...97..951S 1993A&AS...97..951S, Cat. J/A+AS/97/951
Marquez et al., Paper VII 1994A&AS..108..341M 1994A&AS..108..341M
Schuster et al., Paper VIII 1996A&AS..117..317S 1996A&AS..117..317S, Cat. J/A+AS/117/317
Schuster at al., Paper IX 1997A&A...319..796S 1997A&A...319..796S
Schuster at al., Paper XI 2006A&A...445..939S 2006A&A...445..939S, Cat. J/A+A/445/939
(End) William Schuster [UNAM], Patricia Bauer [CDS] 29-Mar-2004