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J/AJ/107/594 Evolved GK stars near the Sun. II. (Eggen 1994)
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Evolved GK stars near the Sun. II. The young disk population.
Eggen O.J.
<Astron. J. 107, 594 (1994)>
=1994AJ....107..594E (SIMBAD/NED BibCode)
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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_{sun}_, 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(C_m_) and from
Fe(M_1_) 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
10^9^yr, 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_{sun}_. 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 102 25 Photometric indices for giants in
galactic clusters
table2 118 6 Wide binaries.
table3 123 345 Young disk population GK giants
table4 127 48 Additional members of the old disk population
table5 19 40 Young disk stars with wkCN
table6 104 6 Peculiar stars in the young disk population
(see Paper I, 1993AJ....106...80E)
table7 104 3 Bright giants in NGC 2287
table8 150 9 Bright giants
table9 123 36 Photometric parameters for bright stars not in
table 3, based on Geneva photometry
table10 25 25 Values of [Fe/H] (McWilliam 1990ApJS...74.1075M)
for stars in table 9
table11 63 17 Problem stars.
table12 64 17 Apparent motions of stars in table 11
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Byte-by-byte Description of file: table1
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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 M_1_ 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 V_0_ magnitude
57- 61 F5.3 mag Cm0 (C_m_)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 C_1_ 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 --- 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 --- 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:
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E(b-y) Mod mean P[Fe/H](M1) P[Fe/H](DDO)
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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
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Star name
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 {beta} index
20 A1 --- n_(R-I)0 [)] When ), {beta} index in (R-I)0 column
22- 25 F4.2 mag V0 V_0_ magnitude
27- 31 F5.3 mag (Cm)0 ? (C_m_)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 --- P[Fe/H](M1) ? Metal abundance from M1 system
65- 69 F5.2 --- P[Fe/H](DDO) ? Metal abundance from DDO system
71- 75 F5.2 mag Mv([C1]) Absolute V magnitude from C_1_ 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 table4 table9
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Bytes Format Units Label Explanations
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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
C_1_ system in table3
M_1_ system in table4
[C_1_] system in table 9
40- 45 F6.3 mag Cm0 ? (C_m_)0 index
47- 52 F6.3 --- P[Fe/H]DDO ? Metal abundance from DDO system
54- 59 F6.3 --- 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 V_0_ 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, x note in Note (2)
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Note (1): : uncertain; V variable; V? Variable?
Note (2): Individual notes:
Table3:
16467 (m48, 45-48, 42-45)=(6.58, 1.177, 0.856, 0.170)mag
from 3 observations.
17459 Possible companion not confirmed by speckle.
17504 Possible spectroscopic binary.
22695 occultation double not confirmed by speckle.
22905 Sp.B., P=91.6d.
27697 Sp.B., P=39.5d. Hyades cluster.
28305/7 Hyades cluster.
30479 R-I is 0.382mag, not 0.392mag as in
Eggen (1989PASP..101..366E).
31296 M1=0.527 not 0.463 as printed in Eggen (1984AJ.....89.1606E).
31444 R Eri, not variable.
33146 M1=0.470 not 0.676 as printed in Eggen (1989PASP..101...45E).
33285 In Eggen (1989PASP..101...45E) b-y should be 0.611mag,
not 0.605mag, and R-I should be 0.335mag, not 0.344mag.
36217 CK 0ri, variable?
37297 Sp.B., P=189.9d.
37434 Possibly composite.
38751 Equal component binary.
43980 Sp.B., P=111.7d. Companion may affect (M1)
45168 Sp.B., P=428.1d.
47205 Possibly composite.
47973 The companion is apparently optical. A0 V, 13arcsec.
(V, b-y, M1, C1, Beta)=(7.53, 0.042, 0.200, 1.007, 2.909)mag
59148 (45-48 , 42-45, 41-42)=(1.226, 0.914, 0.321)mag from
2 observations. Double-lined Sp.B., P=1601 d. DV=0.8mag.
The magnitude has been corrected for the companion
(Griffin, 1986, Proc. RASC 80, 102).
59878 ADS 6160. (V, B-V)=(8.96, 0.55)mag, F8 V, 11arcsec. The
derived modulus would indicate that the companion is a
subgiant (see Eggen, 1966RGOB..120..333E).
83240 Sp.B., P=2824d.
87285 M1=0.493 and C1=0.383, misprinted in
Eggen (1989PASP..101...45E).
87816 R Vel, not variable.
92214 Sp.B., P=1200d.
95345 Dm= 0.0mag, 0.2arcsec.
140489 45-48=1.196mag, not 1.146 (Eggen, 1990PASP..102..507E).
180262 HD 180243, 86arcsec distant and N/E, is an optical companion.
218670 Sp.B., P=409.6d.
Table4:
6595 Magnitude corrected for equal components.
126051 Considered an old disk giant on the basis of W=-61.1km/s.
137126 Sp.B., P=507d.
Table9:
82210 DK UMa, V=0.06mag and P=0.92d
125351 Sp.B, P=212d
148856 Sp.B, P=410.6d
196574 Sp.B, P=205.2d
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Byte-by-byte Description of file: table5
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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 --- P[Fe/H](Cm) Metal abundance from C_m_ system
14- 18 F5.2 --- P[Fe/H](M1) Metal abundance from M_1_ system
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Byte-by-byte Description of file: table6
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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 ? (C_m_)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 C_1_ system
49- 53 F5.2 --- P[Fe/H](Cm) ? Metal abundance from Cm system
55- 59 F5.2 --- 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 table8
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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 (C_m_)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 V_0_ magnitude
70- 74 F5.3 mag [C1] [C1] index
76- 80 F5.2 --- P[Fe/H](DDO) Metal abundance from DDO system (2)
82- 86 F5.2 --- 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 C_1_ 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
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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 mag P[Fe/H](Cm) Metal abundance from C_m_ system
14- 18 F5.2 mag P[Fe/H](M1) Metal abundance from M_1_ system
20- 24 F5.2 Sun [Fe/H] Metallicity
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Byte-by-byte Description of file: table11
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number (Cat. <III/135>)
8- 12 F5.3 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 (C_m_)0 index
33- 37 F5.2 --- P[Fe/H](DDO) Metal abundance from DDO system
39- 43 F5.2 --- 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 C_1_ 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
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Bytes Format Units Label Explanations
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1- 7 A7 --- HD HD number (Cat. <III/135>)
9- 12 F4.2 mag V0 V_0_ 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.
References:
Eggen, Paper I. =1993AJ....106...80E
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(End) James Marcout, Patricia Bauer [CDS] 26-May-1997