2006A&A...451.1065G


Query : 2006A&A...451.1065G

2006A&A...451.1065G - Astronomy and Astrophysics, volume 451, 1065-1079 (2006/6-1)

Na, Mg and Al abundances as a population discriminant for nearby metal-poor stars.

GEHREN T., SHI J.R., ZHANG H.W., ZHAO G. and KORN A.J.

Abstract (from CDS):

Parameters for 55 nearby metal-poor stars are determined using high-resolution spectroscopy. Together with similar data taken from a recent analysis, they are used to show trends of their Galactic evolution with stellar [Fe/H] or [Mg/H] abundances. The separation of abundance ratios between disk and halo stars is used as a basic criterion for population membership. After careful selection of a clean subsample free of suspected or known binaries and peculiar stars, abundances of Mg, Na and Al are based on NLTE kinetic equilibrium calculations applied to spectrum synthesis methods. The relation between [Na/Mg] and [Fe/H] is a continuous enrichment through all three Galactic populations spanning a range of values between a metal-poor plateau at [Na/Mg]=-0.7 and solar values. [Al/Mg] displays a step-like difference between stars of the Galactic halo with <[Al/Mg]≳-0.45 and the two disk populations with <[Al/Mg]≳+0.10. [Al/Mg] ratios, together with the [Mg/Fe] ratios, asymmetric drift velocities V, and stellar evolutionary ages, make possible the individual discrimination between stars of the thick disk and the halo. At present, this evidence is limited by the small number of stars, and by the theoretical and empirical uncertainties of stellar age determinations, but it achieves a high significance. While the stellar sample is not complete with respect to space volume, the resulting abundances indicate the necessity to revise current models of chemical evolution to allow for an adequate production of Al in early stellar generations.

Abstract Copyright:

Journal keyword(s): line: formation - line: profiles - stars: abundances - stars: late-type - Galaxy: evolution

Simbad objects: 74

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Number of rows : 74
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 HE 0107-5240 Pe* 01 09 29.1555567432 -52 24 34.202039148   15.89 15.07 15.10 14.283 CEMP-no 234 0
2 BD+46 610 SB* 02 41 45.7397605656 +47 21 01.290205512       8.8   F8 59 0
3 HD 17948 PM* 02 55 56.9208409368 +61 31 16.094508276   6.001 5.584     F5V 90 0
4 HD 19445 PM* 03 08 25.5883873084 +26 19 51.400965175 8.29 8.52 8.06 7.60 7.27 G2VFe-3 753 0
5 HD 22309 PM* 03 36 03.1577672433 +16 28 02.892083262 8.250 8.230   7.3   G0 62 0
6 HD 22879 Pe* 03 40 22.0652879951 -03 13 01.124265616 7.146 7.222 6.667 6.346 6.016 G0VmF2 467 0
7 HD 29907 SB* 04 38 22.3989572020 -65 24 57.594232229   10.52 9.91     F8V 93 0
8 HD 30649 PM* 04 51 43.5748348116 +45 50 02.818509833 7.59 7.55 6.97 6.45 6.10 G2 221 0
9 HD 31128 PM* 04 52 09.9097086888 -27 03 50.940147636   9.55 9.14     F3/5Vw 127 0
10 BD+03 740 HB* 05 01 16.6226363256 +04 06 37.021736844 9.97 10.17   9.6   sdF0 168 0
11 HD 241253 PM* 05 09 56.9589768600 +05 33 26.741302308   10.24   9.4   G0 92 0
12 BD+47 1140 PM* 05 22 45.8240353224 +47 54 49.250952900   9.82   8.8   G0 31 0
13 HD 243357 PM* 05 25 27.9846887064 +32 24 41.290816500   10.36   9.4   G2 39 0
14 HD 36283 PM* 05 31 13.7777357088 +15 46 24.430037603   9.31   8.2   G4 64 0
15 HD 246067 PM* 05 39 27.4342825426 +03 57 02.683945678       9.9   G0 52 0
16 HD 250792 ** 06 03 14.8636143602 +19 21 38.696218609 9.89 9.898 9.310 8.954 8.547 G1 155 0
17 HD 46341 PM* 06 32 37.9911814872 -06 29 18.504485016   9.16 8.60     G2V 72 0
18 HD 56513 PM* 07 18 28.8688480320 +27 15 10.269640980   8.70   7.6   G2V 57 0
19 HD 58551 PM* 07 26 50.2570417275 +21 32 08.355498800   7.00   6.3   F6V 125 0
20 HD 59374 PM* 07 30 29.0166014070 +18 57 40.616629308   9.03   8.2   F9 111 0
21 HD 59984 PM* 07 32 05.7629164512 -08 52 52.775251032   6.431 5.916     G0VFe-1.6CH-0.5 200 0
22 HD 60319 PM* 07 34 35.1077496408 +16 54 04.028098500   9.46   8.6   F8 90 0
23 BD+36 1650 SB* 07 35 34.0504624728 +35 57 11.264134068   11.00   10.1   ~ 39 0
24 BD+25 1858 SB* 08 08 54.4479591088 +24 37 26.270539852   10.33   9.3   G8 61 0
25 HD 69611 PM* 08 17 29.3481646355 -03 59 22.623439715   8.32 7.74     G0V 130 0
26 HD 233511 PM* 08 19 22.5714563279 +54 05 09.623339988 10.02 10.24   9.4   F4 128 0
27 HD 74000 PM* 08 40 50.8036114756 -16 20 42.516208237 9.84 10.09 9.66     F2 255 0
28 BD+25 1981 PM* 08 44 24.6895754316 +24 47 47.743332208   9.701   9.421   F0 135 0
29 BD+09 2190 PM* 09 29 15.5615542183 +08 38 00.467004388   11.54   10.8   sdA5 126 0
30 Ross 889 Pe* 09 40 43.2053340378 +01 00 29.511836741       10.39   sdA4 158 0
31 HD 84937 PM* 09 48 56.0992891997 +13 44 39.326709913 8.49 8.68 8.32 7.97 7.70 F8Vm-5 755 0
32 BD+65 737 PM* 09 49 42.8199071800 +65 18 15.031855563   10.35   9.2   G3 43 0
33 HD 88446 PM* 10 12 19.0772445336 +17 17 57.051111984   8.40   7.5   G0V 109 0
34 HD 88725 PM* 10 14 08.3343804089 +03 09 04.671822250 8.34 8.33 7.73 7.24 6.89 G3/5V 185 0
35 HD 91784 PM* 10 36 10.8494544192 +15 52 18.963920172   9.70   8.7   G0 32 0
36 BD+29 2091 PM* 10 47 23.1623890044 +28 23 55.925628075   10.72   10.1   F5 133 0
37 BD+21 2244 SB* 10 49 52.6408551888 +20 29 30.149182824   10.56   9.7   ~ 47 0
38 HD 94028 PM* 10 51 28.1256073369 +20 16 38.965439278 8.51 8.69 8.22 7.82 7.54 F8 347 0
39 * 51 LMi PM* 11 05 15.4748350440 +25 12 06.852724053   8.18   7.2   G0 76 0
40 HD 97320 Pe* 11 11 00.7344001848 -65 25 37.745815656   9.769 9.269     F3V 135 0
41 HD 97855 PM* 11 16 04.0344771096 +52 46 23.384130708       6.2   F6VgF6mF3 93 0
42 BD+20 2594 PM* 11 23 16.2307856395 +19 53 37.663112839   10.51   9.6   F9 72 0
43 HD 101177 ** 11 38 44.90018 +45 06 30.3054 7.05 7.00   6.1   G0V+K2V 156 0
44 HD 103095 PM* 11 52 58.7673387755 +37 43 07.254113125 7.38 7.20 6.45 5.80 5.35 K1V_Fe-1.5 769 1
45 HD 104056 PM* 11 59 03.0837574344 -04 46 38.938845000   9.58 9.01     G3V 53 0
46 HD 104800 PM* 12 04 05.5623437085 +03 20 26.710089386   9.80   8.9   G3V 115 0
47 HD 107582 SB* 12 21 28.1422489412 +61 44 50.169203043   8.81   7.9   G3 76 0
48 HD 108076 PM* 12 24 45.8890146375 +38 19 07.459717466   8.58   7.7   G0V 107 0
49 HD 108754 SB* 12 29 42.7349338841 -03 19 58.694940030 9.92 9.74 9.03     G6V 126 0
50 * 10 CVn PM* 12 44 59.4049642264 +39 16 44.098132297 6.47 6.50 5.95 5.41 5.12 F9V_Fe-0.3 351 0
51 HD 114606 PM* 13 11 21.4027999855 +09 37 33.538594491 9.41 9.34 8.72 8.18 7.81 G4 124 0
52 HD 114762 SB* 13 12 19.7410686234 +17 31 01.630334317 7.78         F9VgF8mF4+M6?V 528 1
53 HE 1327-2326 Pe* 13 30 05.9394958608 -23 41 49.699340844 13.761 14.01 13.55 13.50 12.803 CEMP-no 228 0
54 HD 118659 PM* 13 38 00.4711997282 +19 08 53.098205358 9.58 9.47   8.4   G4V 85 0
55 BD+13 2698 ** 13 39 59.57275 +12 35 21.6837   9.914 9.384 9.355   F9V 80 0
56 Wolf 1492 Pe* 13 40 02.4921849768 -00 02 18.750053436 11.601 11.832 11.451 11.184 10.892 sdF0: 273 0
57 HD 119288 PM* 13 42 12.7604652209 +08 23 18.227677011   6.58   5.9   F2V 115 0
58 BD+34 2476 PM* 13 59 09.4837849799 +33 51 39.379962282 10.25 10.44   9.7   sdF5 155 0
59 HD 123710 PM* 14 04 57.0702483072 +74 34 24.892404744   8.79   7.8   G5 64 0
60 HD 126512 PM* 14 25 30.1204369237 +20 35 24.570421287   7.89   6.9   G0 107 0
61 * sig Boo PM* 14 34 40.8173867232 +29 44 42.457673940 4.76 4.84 4.47 4.13 3.94 F4VkF2mF1 588 0
62 BD+26 2606 SB* 14 49 02.3593347728 +25 42 09.192358874 9.92 10.16 9.73 9.27 8.95 A5 362 0
63 HD 134169 SB* 15 08 18.0570477216 +03 55 50.144061360 8.14 8.22 7.70     F7V 203 0
64 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 893 0
65 HD 148816 PM* 16 30 28.4586254384 +04 10 41.602836534 7.75 7.81 7.28 6.82 6.49 F7V 297 0
66 HD 149996 PM* 16 38 17.3887626407 -02 26 31.813926450   9.10 8.49     G1V 84 0
67 BD+18 3423 PM* 17 38 15.6094693200 +18 33 25.483804164 10.17 10.27   9.4   F6V 123 0
68 HD 160693 PM* 17 39 36.8721883235 +37 11 01.504256846 8.94 8.92   8.0   G0 202 0
69 BD+02 3375 PM* 17 39 45.5948675731 +02 24 59.606824535 10.18 10.40 9.92 9.47 9.12 A5 191 0
70 HD 338529 PM* 19 32 31.9104668184 +26 23 26.117367216   9.72   9.2   B5 204 0
71 HD 194598 PM* 20 26 11.9183775668 +09 27 00.429558608 8.62 8.82 8.34 7.90 7.56 F8 293 0
72 HD 200580 SB* 21 04 07.3930420137 +02 59 40.129822016 7.82 7.85   7.0   F9V 159 0
73 HD 201891 PM* 21 11 59.0321495469 +17 43 39.890919730 7.74 7.88 7.37 6.91 6.59 G5V_Fe-2.5 377 0
74 HD 201889 ** 21 11 59.52350 +24 10 05.3897 8.60 8.64 8.05 7.52 7.15 G1V 153 0

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2022.08.18-03:13:52

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