2016ApJ...833..161G


Query : 2016ApJ...833..161G

2016ApJ...833..161G - Astrophys. J., 833, 161-161 (2016/December-3)

Ages of 70 dwarfs of three populations in the solar neighborhood: considering O and C abundances in stellar models.

GE Z.S., BI S.L., CHEN Y.Q., LI T.D., ZHAO J.K., LIU K., FERGUSON J.W. and WU Y.Q.

Abstract (from CDS):

Oxygen and carbon are important elements in stellar populations. Their behavior refers to the formation history of the stellar populations. C and O abundances would also obviously influence stellar opacities and the overall metal abundance Z. With observed high-quality spectroscopic properties, we construct stellar models with C and O elements to give more accurate ages for 70 metal-poor dwarfs, which have been determined to be high-α halo, low-α halo, and thick-disk stars. Our results show that high-α halo stars are somewhat older than low-α halo stars by around 2.0 Gyr. The thick-disk population has an age range in between the two halo populations. The age distribution profiles indicate that high-α halo and low-α halo stars match the in situ accretion simulation by Zolotov et al., and the thick-disk stars might be formed in a relatively quiescent and long-lasting process. We also note that stellar ages are very sensitive to O abundance, since the ages clearly increase with increasing [O/Fe] values. Additionally, we obtain several stars with peculiar ages, including 2 young thick-disk stars and 12 stars older than the universe age.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: disk - Galaxy: formation - Galaxy: halo - stars: abundances - stars: fundamental parameters - stars: fundamental parameters

Simbad objects: 70

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Number of rows : 70
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 BD-03 56 PM* 00 29 26.6605338732 -02 20 57.055990746   11.269 10.648 10.630   ~ 33 0
2 HD 3567 PM* 00 38 31.9473242153 -08 18 33.392826667 9.54 9.70 9.23     F7/8wF3 198 0
3 HD 4308 PM* 00 44 39.2672095011 -65 38 58.277728125 7.31 7.193 6.552     G6VFe-0.9 232 1
4 CD-61 282 PM* 01 36 05.8495294416 -61 05 03.492150337   10.63 10.10     G0 64 0
5 BD-01 306 PM* 02 14 40.2989460555 -01 12 05.123909214 9.60 9.631 9.066 8.712 8.377 G0 140 0
6 G 75-31 PM* 02 38 21.5033134703 +02 26 44.370557521   10.968 10.424 10.389   sd?F8 60 0
7 HD 17820 PM* 02 51 58.3551725257 +11 22 11.940361848 8.85 8.92   8.0   G5 105 0
8 G 5-19 PM* 03 11 26.5406862511 +12 37 09.570643728   11.77   11.0   ~ 45 0
9 Ross 374 PM* 03 26 59.7729638950 +23 46 35.925963580   11.36   10.6   F5 74 0
10 BD+20 571 PM* 03 27 39.4522217875 +21 02 34.994793492   11.36   10.8   G0 55 0
11 HD 22879 Pe* 03 40 22.0652879951 -03 13 01.124265616 7.146 7.222 6.667 6.346 6.016 G0VmF2 467 0
12 HD 25704 ** 04 01 44.6317980946 -57 12 24.598726799   8.65 8.10     F7V 143 0
13 HD 284248 PM* 04 14 35.5161858536 +22 21 04.252516252 9.49 9.68 9.23 8.77 8.43 sdG0 175 0
14 BD-06 855 PM* 04 14 58.1068708300 -05 37 48.859008052   11.278 10.601 10.192 9.794 ~ 77 0
15 HD 283807 PM* 04 44 42.0610259088 +25 56 09.599948808   10.78   9.7   G0 49 0
16 HD 241253 PM* 05 09 56.9589768600 +05 33 26.741302308   10.24   9.4   G0 92 0
17 HD 246067 PM* 05 39 27.4342825426 +03 57 02.683945678       9.9   G0 52 0
18 CD-33 3337 PM* 06 54 47.8101117384 -33 44 49.024262364   9.56 9.03     F5 91 0
19 HD 51754 PM* 06 58 38.5387458343 -00 28 49.696648518 9.60 9.567 9.009 8.663 8.334 G2V 122 0
20 CD-57 1633 HV* 07 06 28.9516977109 -57 27 29.118927115   10.04 9.54     F7V 96 0
21 HD 59392 PM* 07 28 03.2212916981 -38 00 41.278587469   10.17 9.70     F0V 86 0
22 CD-45 3283 PM* 07 34 18.5993129322 -45 16 42.883606401   11.08 10.43     G8V-VI 70 0
23 BD+00 2058A PM* 07 43 43.9667566029 -00 04 00.973799875   10.653 10.202 9.888 9.578 sdF 72 0
24 HD 65907 PM* 07 57 46.9142992394 -60 18 11.058944907 6.17 6.17 5.60     F9.5V 178 0
25 HD 76932 PM* 08 58 43.9327642391 -16 07 57.817644364 6.47 6.39 5.86     G2VFe-1.8CH-1 381 0
26 HD 77110 PM* 08 59 17.8632329568 -35 18 37.116447876   9.43 8.85     G1V 49 0
27 G 46-31 SB* 09 17 04.0007462520 +03 01 29.610961464   11.39   10.6   ~ 63 0
28 HD 298986 PM* 10 17 14.8774744591 -52 29 18.694800089   10.46 10.03   9.48 F5 79 0
29 Ross 892 PM* 10 27 24.2460060626 +01 24 00.190284079   11.55   10.8   sdF8 65 0
30 CD-43 6810 PM* 11 08 40.0891980744 -44 15 33.814235556   10.38 9.82     F8 62 0
31 HD 97320 Pe* 11 11 00.7344001848 -65 25 37.745815656   9.769 9.269     F3V 135 0
32 BD+36 2165 PM* 11 12 47.9997679646 +35 43 43.885058670 9.98 10.19 9.76 9.34 9.02 G0 129 0
33 BD+20 2594 PM* 11 23 16.2307856395 +19 53 37.663112839   10.51   9.6   F9 72 0
34 BD-21 3420 PM* 11 55 28.4581009368 -22 23 13.324840296   10.649 10.107     F5 65 0
35 HD 103723 PM* 11 56 36.0251513496 -21 25 09.829610868   10.554 10.091     F5/6V 75 0
36 HD 105004 PM* 12 05 24.8526164337 -26 35 43.750181317   10.96 10.39     F9 101 0
37 HD 106516 SB* 12 15 10.55731 -10 18 44.6354 6.44 6.57 6.11     F9VFe-1.7CH-0.7 401 0
38 HD 111232 PM* 12 48 51.7525624903 -68 25 30.554783455   8.29 7.61     G8VFe-1.0 133 1
39 HD 111980 SB* 12 53 15.0529661499 -18 31 20.013189741 8.80 8.91 8.38     F7V 164 0
40 HD 113679 PM* 13 05 52.8245053407 -38 30 59.990193435   10.342 9.797     G2/3V 94 0
41 HD 114762 SB* 13 12 19.7410686234 +17 31 01.630334317 7.78         F9VgF8mF4+M6?V 528 1
42 G 150-40 PM* 13 48 52.1482901497 +27 40 09.478619610       10.5   sdF9 30 0
43 HD 120559 PM* 13 51 40.3987847839 -57 26 08.350982731 8.679 8.647 7.982 7.605 7.217 G7VFe-1.4CH-1 149 0
44 HD 121004 PM* 13 53 58.1163626566 -46 32 19.522719077   10.112 9.522     G2V 143 0
45 HD 126681 PM* 14 27 24.9094012952 -18 24 40.454425566   9.939 9.535     G3V 179 0
46 BD+06 2932 PM* 14 43 17.9691516998 +05 49 39.761109950   11.33 10.51     G6V 99 0
47 HD 132475 PM* 14 59 49.7651173448 -22 00 45.815162806 8.98 9.11 8.55     F5/6V 232 1
48 * nu.02 Lup PM* 15 21 48.1499105161 -48 19 03.469906910 6.35 6.30 5.65     G3/5V 261 1
49 G 15-23 PM* 15 29 31.6798974496 +06 08 49.881802340   11.67   10.6   ~ 49 0
50 BD+42 2667 PM* 16 03 13.2988107325 +42 14 46.651500150   10.33   9.6   F5 139 0
51 HD 148816 PM* 16 30 28.4586254384 +04 10 41.602836534 7.75 7.81 7.28 6.82 6.49 F7V 297 0
52 HD 159482 PM* 17 34 43.0816088882 +06 00 51.815208744   8.95   8.0   G0V 151 0
53 BD+18 3423 PM* 17 38 15.6094693200 +18 33 25.483804164 10.17 10.27   9.4   F6V 123 0
54 HD 160693 PM* 17 39 36.8721883235 +37 11 01.504256846 8.94 8.92   8.0   G0 202 0
55 BD-08 4501 PM* 17 47 27.9712915686 -08 46 47.733112329   11.18 10.59     sdF8 119 0
56 HD 163810 ** 17 58 38.4538029750 -13 05 49.654844460 10.15 10.23 9.63     G3V 141 0
57 HD 175179 PM* 18 54 23.2029803432 -04 36 18.621907480 9.56 9.61 9.03     G5V 114 0
58 HD 230409 PM* 19 00 43.3339876251 +19 04 28.418294811   10.78   9.6   G0 81 0
59 HD 179626 PM* 19 13 20.7189797919 -00 35 42.325251766   9.701 9.187 8.844 8.489 F5V 123 0
60 HD 189558 PM* 20 01 00.2452184673 -12 15 20.353638621   8.28 7.73     F8/G2V 181 0
61 BD+05 4481 PM* 20 20 24.5608644037 +06 01 52.826286539   10.75   10.8   G4 61 0
62 HD 193901 PM* 20 23 35.8471605389 -21 22 14.226959304 9.08 9.22 8.67 8.17 7.87 F7V 270 0
63 HD 194598 PM* 20 26 11.9183775668 +09 27 00.429558608 8.62 8.82 8.34 7.90 7.56 F8 293 0
64 HD 199289 PM* 20 58 08.5239126371 -48 12 13.459812756   8.82 8.30     F5V 114 0
65 HD 205650 PM* 21 37 26.0286639804 -27 38 06.697265704   9.59 9.00     F6V 99 0
66 BD+26 4251 PM* 21 43 57.1238515464 +27 23 23.989925868       9.9   F6 82 0
67 BD+11 4725 SB* 22 05 40.6982164308 +12 22 36.113158501   10.19   9.2   G3 86 0
68 BD+07 4841 PM* 22 18 36.5059714907 +08 26 44.962089682   10.84   10.1   G0 107 0
69 HD 219617 ** 23 17 05.04375 -13 51 03.5971 8.41 8.60 8.14 7.70 7.37 F8 305 0
70 HD 222766 PM* 23 43 34.9167361914 -07 55 24.014028099   10.769 10.115 9.728 9.349 G5/6V 78 0

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2022.08.18-03:50:31

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