Abundance analysis of barium stars

Abundance analysis of barium stars
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钡星的丰度分析

DOI:
10.1017/s1743921313007163
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发表时间:
2008-11
期刊:
Proceedings of the International Astronomical Union
影响因子:
--
通讯作者:
Zhang, Bo
Zhang, Bo
中科院分区:
其他
文献类型:
--
作者:
Yang, Guochao;Liang, Yanchun;Cui, Wenyuan;Zhang, Bo

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利用高信噪比和高分辨率的梯级光谱,获得了6颗钡星和2颗CH亚巨星的化学丰度。中子俘获过程元素Y、Zr、Ba、La和Eu相对太阳表现出明显的过丰度,如[Ba/Fe]值在0.45 ~ 1.27之间。其他元素,包括Na、Mg、Al、Si、Ca、Sc、Ti、V、Cr、Mn和Ni,其丰度与太阳的元素相当,它们的[Fe/H]范围在-0.40到0.21之间,这意味着它们属于银河系盘。双星系统的风吸积理论模型的预测可以解释这些恒星中观测到的中子捕获过程元素的丰度模式,这意味着它们过多的重元素可能是由AGB恒星的喷出物引起的,AGB恒星是双星系统中当今白矮星伴星的祖先。
We obtain the chemical abundances of six barium stars and two CH subgiant stars based on the high signal-to-noise ratio and high resolution Echelle spectra. The neutron capture process elements Y, Zr, Ba, La and Eu show obvious overabundances relative to the Sun, for example, their [Ba/Fe] values are from 0.45 to 1.27. Other elements, including Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn and Ni, show comparable abundances to the Solar ones, and their [Fe/H] covers a range from –0.40 to 0.21, which means they belong to the Galactic disk. The predictions of the theoretical model of wind accretion for binary systems can explain the observed abundance patterns of the neutron capture process elements in these stars, which means that their overabundant heavy-elements could be caused by accreting the ejecta of AGB stars, the progenitors of present-day white dwarf companions in binary systems.
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