2012ApJ...757..164R


Query : 2012ApJ...757..164R

2012ApJ...757..164R - Astrophys. J., 757, 164 (2012/October-1)

Oxygen abundances in low- and high-α field halo stars and the discovery of two field stars born in globular clusters.

RAMIREZ I., MELENDEZ J. and CHANAME J.

Abstract (from CDS):

Oxygen abundances of 67 dwarf stars in the metallicity range -1.6 < [Fe/H] < -0.4 are derived from a non-LTE analysis of the 777 nm O I triplet lines. These stars have precise atmospheric parameters measured by Nissen and Schuster, who find that they separate into three groups based on their kinematics and α-element (Mg, Si, Ca, Ti) abundances: thick disk, high-α halo, and low-α halo. We find the oxygen abundance trends of thick-disk and high-α halo stars very similar. The low-α stars show a larger star-to-star scatter in [O/Fe] at a given [Fe/H] and have systematically lower oxygen abundances compared to the other two groups. Thus, we find the behavior of oxygen abundances in these groups of stars similar to that of the α elements. We use previously published oxygen abundance data of disk and very metal-poor halo stars to present an overall view (-2.3 < [Fe/H] < +0.3) of oxygen abundance trends of stars in the solar neighborhood. Two field halo dwarf stars stand out in their O and Na abundances. Both G53-41 and G150-40 have very low oxygen and very high sodium abundances, which are key signatures of the abundance anomalies observed in globular cluster (GC) stars. Therefore, they are likely field halo stars born in GCs. If true, we estimate that at least 3%±2% of the local field metal-poor star population was born in GCs.

Abstract Copyright:

Journal keyword(s): Galaxy: disk - Galaxy: evolution - Galaxy: formation - Galaxy: halo - stars: abundances - stars: Population II

VizieR on-line data: <Available at CDS (J/ApJ/757/164): table1.dat>

Simbad objects: 77

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Number of rows : 77
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 BD+79 22 PM* 00 58 11.6815977504 +80 06 49.256969112       9.3   G0 29 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 HD 250792 ** 06 03 14.8636143602 +19 21 38.696218609 9.89 9.898 9.310 8.954 8.547 G1 155 0
19 CD-33 3337 PM* 06 54 47.8101117384 -33 44 49.024262364   9.56 9.03     F5 91 0
20 HD 51754 PM* 06 58 38.5387458343 -00 28 49.696648518 9.60 9.567 9.009 8.663 8.334 G2V 122 0
21 CD-57 1633 HV* 07 06 28.9516977109 -57 27 29.118927115   10.04 9.54     F7V 96 0
22 HD 59392 PM* 07 28 03.2212916981 -38 00 41.278587469   10.17 9.70     F0V 86 0
23 CD-45 3283 PM* 07 34 18.5993129322 -45 16 42.883606401   11.08 10.43     G8V-VI 70 0
24 BD+00 2058A PM* 07 43 43.9667566029 -00 04 00.973799875   10.653 10.202 9.888 9.578 sdF 72 0
25 HD 233511 PM* 08 19 22.5714563279 +54 05 09.623339988 10.02 10.24   9.4   F4 128 0
26 HD 76932 PM* 08 58 43.9327642391 -16 07 57.817644364 6.47 6.39 5.86     G2VFe-1.8CH-1 381 0
27 HD 298986 PM* 10 17 14.8774744591 -52 29 18.694800089   10.46 10.03   9.48 F5 79 0
28 Ross 892 PM* 10 27 24.2460060626 +01 24 00.190284079   11.55   10.8   sdF8 65 0
29 CD-43 6810 PM* 11 08 40.0891980744 -44 15 33.814235556   10.38 9.82     F8 62 0
30 HD 97320 Pe* 11 11 00.7344001848 -65 25 37.745815656   9.769 9.269     F3V 135 0
31 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
32 BD+20 2594 PM* 11 23 16.2307856395 +19 53 37.663112839   10.51   9.6   F9 72 0
33 BD+51 1696 PM* 11 46 35.1556060454 +50 52 54.680145444 10.32 10.47   9.5   sdG0 143 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 111980 SB* 12 53 15.0529661499 -18 31 20.013189741 8.80 8.91 8.38     F7V 164 0
39 HD 113679 PM* 13 05 52.8245053407 -38 30 59.990193435   10.342 9.797     G2/3V 94 0
40 HD 114762 SB* 13 12 19.7410686234 +17 31 01.630334317 7.78         F9VgF8mF4+M6?V 528 1
41 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3252 0
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 G 15-23 PM* 15 29 31.6798974496 +06 08 49.881802340   11.67   10.6   ~ 49 0
49 BD+08 3095 PM* 15 50 58.9334638272 +08 25 23.721884040   10.60   9.8   G2 79 0
50 BD+42 2667 PM* 16 03 13.2988107325 +42 14 46.651500150   10.33   9.6   F5 139 0
51 HD 146296 PM* 16 21 11.3151618845 -71 17 13.024312315   10.37 9.77     G3V 45 0
52 HD 148816 PM* 16 30 28.4586254384 +04 10 41.602836534 7.75 7.81 7.28 6.82 6.49 F7V 297 0
53 HD 159482 PM* 17 34 43.0816088882 +06 00 51.815208744   8.95   8.0   G0V 151 0
54 BD+18 3423 PM* 17 38 15.6094693200 +18 33 25.483804164 10.17 10.27   9.4   F6V 123 0
55 HD 160693 PM* 17 39 36.8721883235 +37 11 01.504256846 8.94 8.92   8.0   G0 202 0
56 HD 160617 PM* 17 42 49.3234249010 -40 19 15.503834657   9.18 8.73 8.394 8.065 G0 194 0
57 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13083 0
58 BD-08 4501 PM* 17 47 27.9712915686 -08 46 47.733112329   11.18 10.59     sdF8 119 0
59 HD 163810 ** 17 58 38.4538029750 -13 05 49.654844460 10.15 10.23 9.63     G3V 141 0
60 HD 175179 PM* 18 54 23.2029803432 -04 36 18.621907480 9.56 9.61 9.03     G5V 114 0
61 HD 230409 PM* 19 00 43.3339876251 +19 04 28.418294811   10.78   9.6   G0 81 0
62 HD 179626 PM* 19 13 20.7189797919 -00 35 42.325251766   9.701 9.187 8.844 8.489 F5V 123 0
63 CD-42 14278 PM* 19 32 19.1474936380 -42 12 43.711761026   10.76 10.29     F5Vwl 36 0
64 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1076 0
65 HD 189558 PM* 20 01 00.2452184673 -12 15 20.353638621   8.28 7.73     F8/G2V 181 0
66 G 24-3 Pe* 20 05 44.3170407024 +04 02 52.812418452   10.92   10.2   sdF8 88 0
67 BD+05 4481 PM* 20 20 24.5608644037 +06 01 52.826286539   10.75   10.8   G4 61 0
68 HD 193901 PM* 20 23 35.8471605389 -21 22 14.226959304 9.08 9.22 8.67 8.17 7.87 F7V 270 0
69 HD 194598 PM* 20 26 11.9183775668 +09 27 00.429558608 8.62 8.82 8.34 7.90 7.56 F8 293 0
70 HD 199289 PM* 20 58 08.5239126371 -48 12 13.459812756   8.82 8.30     F5V 114 0
71 HD 205650 PM* 21 37 26.0286639804 -27 38 06.697265704   9.59 9.00     F6V 99 0
72 BD+26 4251 PM* 21 43 57.1238515464 +27 23 23.989925868       9.9   F6 82 0
73 BD+11 4725 SB* 22 05 40.6982164308 +12 22 36.113158501   10.19   9.2   G3 86 0
74 BD+17 4708 SB* 22 11 31.3756832854 +18 05 34.177983548 9.73 9.91 9.46 9.03 8.70 sdF8 553 0
75 BD+07 4841 PM* 22 18 36.5059714907 +08 26 44.962089682   10.84   10.1   G0 107 0
76 HD 219617 ** 23 17 05.04375 -13 51 03.5971 8.41 8.60 8.14 7.70 7.37 F8 305 0
77 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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2022.08.09-03:12:32

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