The chemical composition of HD 196944: a carbon and s-process rich, very metal-poor star

被引：0
|
作者：
Zacs, L
Nissen, PE
Schuster, WJ
机构：
[1] Ventspils Int Radio Astron Ctr, LV-1050 Riga, Latvia
[2] Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus C, Denmark
[3] Univ Nacl Autonoma Mexico, Observ Astron Nacl, Ensenada 22800, Baja California, Mexico
来源：
ASTRONOMY & ASTROPHYSICS | 1998年 / 337卷 / 01期
关键词：
stars : evolution; stars : abundances; stars : chemically peculiar; stars : AGB and post-AGB; stars : individual : HD 196944;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
An LTE abundance analysis of the post-AGE candidate star HD 196944 is presented based on high resolution, high S/N spectra. The radial velocity of HD 196944 is found to be -174 km s(-1) indicating that it belongs to the halo population. The spectroscopic analysis provides the atmospheric parameters T-eff = 5250 K, log g = 1.7 (cgs), xi(t) = 1.9 km s(-1) corresponding to those for G2-5 (bright) giants. A low iron abundance, [Fe/H] = -2.45, is derived confirming the old, low mass nature of the star. With [C/Fe] = +1.4 and a mean s-process overabundance of [s/Fe] = +1.1 the peculiar atmospheric composition of HD 196944 is confirmed. Possible evolutionary stages of HD 196944, that can explain its atmospheric parameters and composition, are discussed.
引用
收藏
页码：216 / 222
页数：7
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