J/AJ/107/594 Evolved GK stars near the Sun. II. (Eggen 1994)
Evolved GK stars near the Sun. II. The young disk population.
Eggen O.J.
<Astron. J. 107, 594 (1994)>
=1994AJ....107..594E 1994AJ....107..594E (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Space velocities
Abstract:
From a sample of nearly 2000 GK giants a group of young disk stars
with well determined space motions has been selected. The zero point
of the luminosity calibrations, both from the ultraviolet flux
(modified Stromgren system) and that in the region of 4200 to 4900A
(DDO system), show a discontinuity of about a half magnitude at the
border of the young disk and old disk domains. The population
separation is based on the space velocity components, which are also
an age discriminants with the population interface near 2x10^9yr,
based on models with convective overshoot at the core. This age
corresponds to giant masses near 1.7M☉, near the critical mass
separating the young stars that do not burn helium in degenerate cores
from older stars that do. Ten percent of both populations show CN
anomalies in that the derived value of P[Fe/H] from CN(Cm) and from
Fe(M1) differ by more than 0.1dex and the weak and strong CN stars
occur equally in the old disk but the weak CN stars predominate in the
young disk. Peculiar stars, where flux distortions affect the
luminosity calibrations, are of the CH+ (Ba II) and CH- (weak G band)
variety and represent less than 1% of the stars in both populations.
The young disk giants are restricted to ages greater than about
109yr, because younger stars are bright giants or supergiants
(luminosity class II or I), and younger than about 2x10^9yr, because
the old disk-young disk boundary occurs near 1.7M☉. The
distribution of heavy element abundances, P[Fe/H], for young disk
giants is both more limited in range (±0.4dex) and is skewed toward
higher abundances, compared with the nearly normal distribution for
old disk giants. The distribution of (U,V) velocity vectors gives
(U,V,W) and their dispersions =(+17.6±18.4, -14.8±8.4, -6.9±13.0)
and (+3.6±38.4, -20.7±27.5, -6.7±17.3) km/s for young and old
disk giants, respectively.
For a description of the DDO and RI Eggen photometric system, see e.g.
GCPD/12 and GCPD/17 , respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 102 25 Photometric indices for giants in
galactic clusters
table2.dat 118 6 Wide binaries.
table3.dat 123 345 Young disk population GK giants
table4.dat 127 48 Additional members of the old disk population
notes.dat 80 44 Notes on tables 3, 4 and 9.
table5.dat 19 40 Young disk stars with wkCN
table6.dat 104 6 Peculiar stars in the young disk population
(see Paper I, 1993AJ....106...80E 1993AJ....106...80E)
table7.dat 104 3 Bright giants in NGC 2287
table8.dat 150 9 Bright giants
table9.dat 123 36 Photometric parameters for bright stars not in
table 3, based on Geneva photometry
table10.dat 25 25 Values of [Fe/H] (McWilliam 1990ApJS...74.1075M 1990ApJS...74.1075M)
for stars in table 9
table11.dat 63 17 Problem stars.
table12.dat 64 17 Apparent motions of stars in table 11
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name
10- 18 A9 --- Star Star designation
20- 24 F5.3 mag M1 M1 index (1)
26- 30 F5.3 mag [C1] [C1] index
32- 36 F5.3 mag b-y b-y colour index
38- 42 F5.3 mag R-I R-I colour index
44- 48 F5.3 mag E(b-y) Colour excess in b-y (2)
49 A1 --- u_E(b-y) [)] Uncertainty flag on E(b-y)
51- 55 F5.2 mag V0 V0 magnitude
57- 61 F5.3 mag Cm0 (Cm)0 index
63- 68 F6.3 mag D(45-48)0 {DELTA}(45-48)0 colour index
70- 74 F5.2 mag Mv(C1) Absolute V magnitude from C1 system
75 A1 --- u_Mv(C1) [)] Uncertainty flag on Mv(C1)
77- 81 F5.2 mag Mv(DDO) Absolute V magnitude from DDO system
82 A1 --- u_Mv(DDO) [)] Uncertainty flag on Mv(DDO)
84- 87 F4.2 mag Modm ? Mean distance modulus (2)
88 A1 --- u_Modm [)] Uncertainty flag on Modm
90- 94 F5.2 [Sun] P[Fe/H](M1) Metal abundance from M1 system (2)
95 A1 --- u_P[Fe/H](M1) [)] Uncertainty flag on P[Fe/H](M1)
97-101 F5.2 [Sun] P[Fe/H](DDO) Metal abundance from DDO system (2)
102 A1 --- u_P[Fe/H](DDO) [)] Uncertainty flag on P[Fe/H](DDO)
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Note (1): M1 = m1 (Stroemgren) for (b-y)<0.3mag
and C1 (Stroemgren) for (b-y)<0.2mag
Note (2): Average values:
----------------------------------------------------------------------
E(b-y) Mod mean P[Fe/H](M1) P[Fe/H](DDO)
----------------------------------------------------------------------
NGC 752 0.023±0.07 7.90±0.07 -0.21±0.03 -0.20±0.06
NGC 2423 0.065 0.607 9.32 0.19 +0.08 0.09
IC 4651 0.096 0.018 9.56 0.15 +0.28 0.07
Praesepe 0.000 5.63 0.20 +0.08 0.06 +0.13 0.08
----------------------------------------------------------------------
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number (Cat. III/135)
7 A1 --- m_HD Multiplicity index on HD star number
9- 13 F5.3 mag E(b-y) ? Reddening E(b-y)
15- 19 F5.3 mag (R-I)0 (R-I)0 colour index or β index
20 A1 --- n_(R-I)0 [)] When ), β index in (R-I)0 column
22- 25 F4.2 mag V0 V0 magnitude
27- 31 F5.3 mag (Cm)0 ? (Cm)0 index
33- 37 F5.3 mag D(45-48)0 ? {DELTA}(45-48)0 colour index
39- 43 F5.3 mag [C1] [C1] index
45- 49 F5.3 mag (M1)0 (M1)0 or [M1] index
50 A1 --- n_(M1)0 [)] When ), [M1] index in (M1)0 column
52- 57 A6 --- SpType Spectral type
59- 63 F5.2 [Sun] P[Fe/H](M1) ? Metal abundance from M1 system
65- 69 F5.2 [Sun] P[Fe/H](DDO) ? Metal abundance from DDO system
71- 75 F5.2 mag Mv([C1]) Absolute V magnitude from C1 system
77- 81 F5.2 mag Mod ? Distance modulus
83- 86 F4.2 mag Mv(DDO) Absolute V magnitude from DDO system
88- 90 I3 mas/yr pmRA ? Proper motion in right ascension
92- 94 I3 mas/yr pmDE ? Proper motion in declination
96-100 F5.1 km/s RV ? Radial velocity
102-106 F5.1 km/s Uvel ? U velocity (away from the galactic center)
108-112 F5.1 km/s Vvel ? V velocity (direction of galactic rotation)
114-118 F5.1 km/s Wvel ? W velocity (toward North Galactic Pole)
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Byte-by-byte Description of file: table3.dat table4.dat table9.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD number (Cat. III/135)
8- 13 F6.3 mag E(b-y) Reddening E(b-y)
15- 19 F5.3 mag (R-I)0 (R-I)0 colour index
21- 26 F6.3 mag D(45-48)0 ? {DELTA}(45-48)0 colour index
28- 32 F5.2 mag Mv(DDO) ? Absolute V magnitude from DDO system
34- 38 F5.2 mag Mv(C1) ? Absolute V magnitude from
C1 system in table3
M1 system in table4
[C1] system in table 9
40- 45 F6.3 mag Cm0 ? (Cm)0 index
47- 52 F6.3 [Sun] P[Fe/H]DDO ? Metal abundance from DDO system
54- 59 F6.3 [Sun] P[Fe/H]2 ? Metal abundance from
[M1] system in table3
[C1] system in table4
(M)0 system in table9
60 A1 --- u_P[Fe/H]2 [)] Uncertainty flag on P[Fe/H][M1]
61- 64 F4.2 mag V0 V0 magnitude
66- 69 F4.2 mag Mod Distance modulus
71- 74 I4 mas/yr pmRA Proper motion in right ascension
76- 79 I4 mas/yr pmDE Proper motion in declination
81- 85 F5.1 km/s RV Radial velocity
86- 87 A2 --- u_RV [: V?] Note on RV (1)
88- 93 F6.1 km/s Uvel U velocity (away from the galactic center)
94 A1 --- u_Uvel Uncertainty flag on Uvel
95-100 F6.1 km/s Vvel V velocity (direction of galactic rotation)
101 A1 --- u_Vvel Uncertainty flag on Vvel
102-106 F5.1 km/s Wvel W velocity (toward North Galactic Pole)
107 A1 --- u_Wvel Uncertainty flag on Wvel
108-116 A9 --- SpType Spectral type
118-121 I4 --- HR ? HR number (Cat. V/50)
123-127 A5 --- Note Individual notes, see file "notes.dat"
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Note (1): : uncertain; V variable; V? Variable?
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD identification, as in table3, 4, 9.
9- 80 A72 --- Text Text of the note
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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- 6 I6 --- HD HD number (Cat. III/135)
8- 12 F5.2 [Sun] P[Fe/H](Cm) Metal abundance from Cm system
14- 18 F5.2 [Sun] P[Fe/H](M1) Metal abundance from M1 system
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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- 3 A3 --- CHtype CH+ or CH- type
5- 10 I6 --- HD HD number (Cat. III/135)
12- 16 F5.3 mag (R-I)0 (R-I)0 colour index
18- 22 F5.3 mag D(45-48)0 ? {DELTA}(45-48)0 colour index
24- 29 F6.3 mag Cm0 ? (Cm)0 index
31- 35 F5.3 mag [C1] [C1] index
37- 41 F5.2 mag Mv(DDO) ? Absolute V magnitude from DDO system
43- 47 F5.2 mag Mv([C1]) Absolute V magnitude from C1 system
49- 53 F5.2 [Sun] P[Fe/H](Cm) ? Metal abundance from Cm system
55- 59 F5.2 [Sun] P[Fe/H](M1) Metal abundance from M1 system
61- 64 I4 --- HR ? HR number (Cat. V/50)
66- 87 A22 ---- SpType Spetral type (1)
89- 92 F4.2 mag Mod Distance modulus
94- 96 I3 km/s Uvel U velocity (away from the galactic center)
98-100 I3 km/s Vvel V velocity (direction of galactic rotation)
102-104 I3 km/s Wvel W velocity (toward North Galactic Pole)
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Note (1): From Keenan and McNeil (1989, Cat III/150) except for HD 105956,
from Houk (1978, Cat. III/51)
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Byte-by-byte Description of file: table7.dat table8.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number (Cat. III/135)
8- 9 A2 --- No Star number in NGC 2287
11- 15 F5.3 mag E(b-y) Reddening E(b-y)
17- 21 F5.3 mag (R-I)0 (R-I)0 colour index
23- 27 F5.3 mag (M1)0 (M1)0 index
29- 33 F5.3 mag Cm0 (Cm)0 index
35- 39 F5.3 mag (45-48)0 (45-48)0 colour index
41- 45 F5.3 mag (42-45)0 (42-44)0 colour index
47- 51 F5.3 mag D(45-48)0 {DELTA}(45-48)0 colour index
53- 63 A11 --- SpType Spectral type (1)
65- 68 F4.2 mag V0 V0 magnitude
70- 74 F5.3 mag [C1] [C1] index
76- 80 F5.2 [Sun] P[Fe/H](DDO) Metal abundance from DDO system (2)
82- 86 F5.2 [Sun] P[Fe/H](M1) Metal abundance from M1 system (2)
88- 92 F5.2 mag Mv(DDO) Absolute V magnitude from DDO system
94- 98 F5.2 mag Mv(C1) Absolute V magnitude from C1 system
99 A1 --- u_Mv(C1) [)] Uncertainty flag on Mv(C1)
101-104 F4.2 mag Mod Distance modulus from DDO system (2)
106-110 F5.1 km/s Uvel ? U velocity (away from the galactic center)
112-116 F5.1 km/s Vvel ? V velocity (direction of galactic rotation)
118-122 F5.1 km/s Wvel ? W velocity (toward North Galactic Pole)
124-150 A27 --- Notes Notes
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Note (1): Spectral types from Keenan and McNeil (1989, Cat III/150)
Note (2): Average values for NGC 2287
P[Fe/H](DDO)=-0.15dex ; P[Fe/H](M1)=-0.07dex ; Mod DDO = 8.87mag
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD number (Cat. III/135)
8- 12 F5.2 [Sun] P[Fe/H](Cm) Metal abundance from Cm system
14- 18 F5.2 [Sun] P[Fe/H](M1) Metal abundance from M1 system
20- 24 F5.2 [Sun] [Fe/H] Metallicity
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD number (Cat. III/135)
8- 12 F5.3 mag E(b-y) Redenning E(b-y)
14- 18 F5.3 mag (R-I)0 (R-I)0 colour index
20- 24 F5.3 mag D(45-48)0 {DELTA}(45-48)0 colour index
25 A1 --- u_D(45-48)0 [)] Uncertainty flag on D(45-48)0
27- 31 F5.3 mag (Cm)0 (Cm)0 index
33- 37 F5.2 [Sun] P[Fe/H](DDO) Metal abundance from DDO system
39- 43 F5.2 [Sun] P[Fe/H](M1) Metal abundance from M1 system
44 A1 --- u_P[Fe/H](M1) [)] Uncertainty flag on P[Fe/H](M1)
46- 50 F5.2 mag Mv(DDO) Absolute V magnitude from DDO system
51 A1 --- u_Mv(DDO) [)] Uncetrtainty flag on Mv(DDO)
53- 57 F5.2 mag Mv(C1) Absolute V magnitude from C1 system
58 A1 --- u_Mv(C1) [)] Uncetrtainty flag on Mv(C1)
60- 63 I4 --- HR ? HR number (Cat. V/50)
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Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD number (Cat. III/135)
7 A1 --- m_HD Multiplicity index on HD number
9- 12 F4.2 mag V0 V0 magnitude
14- 17 F4.2 mag Mod Distance modulus
18 A1 --- u_Mod Uncertainty flag on Mod
20- 22 I3 mas/yr pmRA Proper motion in right ascension
24- 27 I4 mas/yr pmDE Proper motion in declination
29- 33 F5.1 km/s RV Radial velocity
34 A1 --- n_RV [V] V: variable
36- 40 F5.1 km/s Uvel U velocity (away from the galactic center)
42- 46 F5.1 km/s Vvel v velocity (direction of galactic rotation)
48- 52 F5.1 km/s Wvel W velocity (toward North Galactic Pole)
54- 64 A11 --- Sptype Spectral type
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History: Prepared via OCR at CDS.
* 13-Feb-2003: Notes collected in a dedicated table.
References:
Eggen, Paper I. =1993AJ....106...80E 1993AJ....106...80E
(End) James Marcout, Patricia Bauer [CDS] 26-May-1997