The isotopic 6Li/7Li ratio in Centaurus X-4 and the origin of Li in X-ray binaries
The isotopic 6Li/7Li ratio in Centaurus X-4 and the origin of Li in X-ray binaries
复制标题
Centaurus X-4 中的同位素 6Li/7Li 比值和 X 射线双星中 Li 的来源
DOI：
10.1051/0004-6361:20066875
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发表时间：
2007
影响因子：
6.5
通讯作者：
M. Zoccali
中科院分区：
文献类型：
--
作者：
J. Casares;P. Bonifacio;J. Hernández;P. Molaro;M. Zoccali
上下文冷星是致密天体的伴星，已知它们的锂丰度比同光谱类型的场星高，场星的锂丰度严重不足。这可能是由于在这些系统中的Li生产或Li保存。目标。我们的目标是测量中子星星X射线双星岑X-4的伴星星星中锂同位素的比值。方法.我们使用2000年和2004年获得的UVES光谱周围的轨道象限。光谱分析与频谱合成技术和误差估计与蒙特卡罗模拟。结果我们在68%的置信水平下测量A（Li）= 2.87± 0.20和6 Li/ 7 Li = 0.12 + 0.08 −0.05。我们还提供了更新的系统参数“
Context. Cool stars, companions to compact objects, are known to show Li abundances which are high compared to field stars of the same spectral type, which are heavily Li depleted. This may be due either to Li production or Li preservation in these systems. Aims. Our aim is to measure the lithium isotopic ratio in the companion star of the neutron star X-ray binary Cen X-4. Methods. We use UVES spectra obtained in years 2000 and 2004 around the orbital quadratures. The spectra are analysed with spectrum synthesis techniques and the errors estimated with Monte Carlo simulations. Results. We measure A(Li) = 2.87± 0.20 and 6 Li/ 7 Li = 0.12 +0.08 −0.05 at 68% confidence level. We also present updated system parameters „ „ „ „ „ „ „ „ „ „
中子星双星半人马座 X-4 副星的化学丰度
DOI：
--
发表时间：
2005
期刊：
The Astrophysical Journal 630
影响因子：
--
作者：
Gonzalez Hernandez;J.I.;et al.
通讯作者：
et al.