2000A&A...353..978M


Query : 2000A&A...353..978M

2000A&A...353..978M - Astronomy and Astrophysics, volume 353, 978-986 (2000/1-3)

Oxygen abundance in halo stars from OI triplet.

MISHENINA T.V., KOROTIN S.A., KLOCHKOVA V.G. and PANCHUK V.E.

Abstract (from CDS):

Oxygen abundance for 14 halo stars through the O I 7774Å triplet have been derived from high resolution spectra (R=25,000; S/N>100) obtained with echelle-spectrometer of 6-m telescope of Special Astrophysical Observatory of the Russian Academy of Sciences. The effective temperature, metallicity and other parameters have been examined. For example, the effective temperature was found from Hα line wings and photometric indices. The abundance analysis was carried out using both LTE and non-LTE conceptions. For this aim, we have specified the oxygen atomic model. The average [O/Fe] value appeared to be 0.61±0.21 from the non-LTE determination. A trend of oxygen abundance increasing along with the iron abundance decreasing was found. The relation between [O/Fe] and [Fe/H] is linear: [O/Fe]=-0.370x[Fe/H]+0.047. In addition to the sample of our program stars, we also involved in the analysis, 24 targets from Cavallo et al. (1997). For their original results we have determined the necessary non-LTE corrections. Our data are compared with the results of other works (Tomkin et al., 1992AJ....104.1568T; King & Boesgaard, 1995AJ....109..383K; Boesgaard et al., 1999AJ....117..492B).

Abstract Copyright:

Journal keyword(s): atomic processes - line: formation - line: profiles - methods: numerical - stars: abundances - stars: atmospheres

Simbad objects: 34

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Number of rows : 34
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 HD 245 SB* 00 08 50.8113967803 +86 47 16.384997325   9.02   8.0   G0 81 0
2 V* LN Peg RS* 00 12 30.2951225569 +14 33 48.897713959   9.40   8.0   G8V+K5V 97 0
3 BD+66 268 PM* 03 31 17.4003449284 +66 43 49.024902152 10.48 10.57 9.91 9.30 8.87 G0 163 0
4 BD+37 1458 PM* 06 16 01.5222885381 +37 43 18.754343426 9.41 9.52 8.92 8.34 7.91 G0 131 0
5 HD 44007 Pe* 06 18 48.5269024752 -14 50 43.423248948   8.85 8.06 7.69   G5(IV)wF3/5 176 0
6 HD 45282 Pe* 06 26 40.7720940072 +03 25 29.792391024 8.71 8.69 8.03     Gwl 146 0
7 HD 64090 PM* 07 53 33.1208795337 +30 36 18.256204963 8.75 8.86 8.25 7.70 7.30 K0:V_Fe-3 351 0
8 HD 65583 PM* 08 00 32.1297283166 +29 12 44.475101673 7.89 7.71 7.00 6.40 5.98 K0V_Fe-1.3 303 0
9 HD 76932 PM* 08 58 43.9327642391 -16 07 57.817644364 6.47 6.39 5.86     G2VFe-1.8CH-1 380 0
10 HD 87140 PM* 10 04 43.1808079344 +54 20 43.425537648 9.70 9.68 8.98     K0 108 0
11 HD 94028 PM* 10 51 28.1256073369 +20 16 38.965439278 8.51 8.69 8.22 7.82 7.54 F8 346 0
12 HD 97916 SB* 11 15 54.2294766960 +02 05 12.089062104 9.50 9.61   8.9   F0V 163 0
13 HD 103912 PM* 11 58 00.0818432640 +48 12 12.437298792   9.25   7.8   G5V: 67 0
14 HD 108317 Pe* 12 26 36.8319587208 +05 18 09.023783400       7.7   G2IVm-5 155 0
15 HD 111721 RG* 12 51 25.1948519215 -13 29 28.166947989   8.78 7.97     G6V 152 0
16 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 800 0
17 HD 128279 Pe* 14 36 48.5108525999 -29 06 46.612858494 8.64 8.63 8.00     Gw 183 0
18 HD 157948 SB* 17 24 42.4258922448 +38 02 10.529569464   9.06 8.18 7.6   G5 59 0
19 BD+23 3130 Pe* 17 32 41.6247211304 +23 44 11.625460773       8.6   G0III 124 0
20 HD 163810 ** 17 58 38.4538029750 -13 05 49.654844460 10.15 10.23 9.63     G3V 141 0
21 HD 166161 PM* 18 09 40.6841536776 -08 46 45.603012144 9.53 9.13 8.16     G0wF0 136 0
22 HD 171496 * 18 36 07.4934525456 -24 26 11.309788572   9.59 8.52     G8IV 70 1
23 HD 175305 RG* 18 47 06.4416868934 +74 43 31.451436187 8.07 7.93 7.18 6.52 6.03 G5III 207 0
24 BD+42 3187 RG* 18 54 16.9544655840 +42 59 00.384912816       9.6   G2 80 0
25 BD-18 5550 Pe* 19 58 49.7371417608 -18 12 11.140126164 10.18 10.03 9.35 9.04 8.74 CEMP-no 168 0
26 HD 189558 PM* 20 01 00.2452184673 -12 15 20.353638621   8.28 7.73     F8/G2V 181 0
27 HD 190287 PM* 20 05 38.2682394768 -34 55 11.942867100   9.23 8.54     G6Vw 59 0
28 HD 345957 PM* 20 10 48.1625876064 +23 57 54.510596568   9.36   8.6   G0V: 139 0
29 HD 358059 Pe* 20 56 09.1348060632 -13 31 17.690158776   11.016 10.192     G0 57 0
30 HD 201889 ** 21 11 59.52350 +24 10 05.3897 8.60 8.64 8.05 7.52 7.15 G1V 153 0
31 BD+59 2407 PM* 21 39 16.1492801103 +60 17 01.797074143       10.0   G2 64 0
32 BD+26 4251 PM* 21 43 57.1238515464 +27 23 23.989925868       9.9   F6 82 0
33 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
34 HD 219715 PM* 23 18 01.1972551195 +09 04 28.067869775       8.8   G5 46 0

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2022.07.05-18:34:46

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