A Spectroscopic Study of Barium Stars

被引：0
|
作者：
Liu, G. Q. [1 ]
Liang, Y. C. [1 ]
Deng, L. [1 ]
机构：
[1] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
来源：
ART OF MODELLING STARS IN THE 21ST CENTURY | 2008年 / 252期
关键词：
Stars: abundances; Stars: atmospheres; Stars: chemically peculiar; Stars: evolution; binaries: spectroscopic;
D O I：
10.1017/S1743921308023399
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present an analysis of eight barium stars, providing their atmospheric parameters (T-eff, log g, [Fe/H], xi(t)) and chemical abundances, based on the high signal-to-noise ratio and high resolution Echelle spectra. The s-process elements Y, Zr, Ba, La, Eu show obvious overabundance relative to the San. And Na, Mg, Al, Si, Ca, Sc, Ti V, Cr, Mn, Ni show comparable abundances to the Solar ones. The results of theoretical model of wind accretion for binary systems can explain the observed abundance patterns of the neutron capture process elements in these Ba stars, which means that their overabundant heavy-elements could be caused by accreting the ejecta of AGB stars, the progenitors of the present white dwarf companions in the binary systems.
引用
收藏
页码：425 / 426
页数：2
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