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arXiv 0902.3700astro-ph.SR
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闪烁黑洞X射线双星M33 X-7的电流性质

The Eclipsing Black Hole X-ray Binary M33 X-7: Understanding the Current Properties

Francesca Valsecchi, Bart Willems, Tassos Fragos, Vicky Kalogera

摘要:

本文研究了黑洞X射线双星系统M33 X-7的形成和演化。特别是,我们检查是否占系统误差的恒星参数固有的单星模型,以及在距离M33的不确定性,可以解释观测到的和预期的光度之间的差异70太阳质量的伴星。我们的分析假设伴星和黑洞祖先之间没有先前的相互作用。我们使用四种不同的恒星演化代码,修改后包括各种当前的恒星风处方。对于满足施主星有效温度和光度观测约束的模型,我们重新计算了黑洞质量、轨道间距和平均X射线光度。我们的最佳模型,同时满足所有的观测约束,除了观测推断的伴星质量,由一个~13太阳质量的黑洞和~54太阳质量的伴星。我们的结论是,一颗恒星的观测质量和光度不能通过单星演化模型来解释,和伴星和黑洞祖之间的先前的相互作用应该考虑在内。

英文摘要:

We explore the formation and evolution of the black hole X-ray binary system M33 X-7. In particular, we examine whether accounting for systematic errors in the stellar parameters inherent to single star models, as well as the uncertainty in the distance to M33, can explain the discrepancy between the observed and expected luminosity of the ~70 solar masses companion star. Our analysis assumes no prior interactions between the companion star and the black hole progenitor. We use four different stellar evolution codes, modified to include a variety of current stellar wind prescriptions. For the models satisfying the observational constraints on the donor star's effective temperature and luminosity, we recalculate the black hole mass, the orbital separation, and the mean X-ray luminosity. Our best model, satisfying simultaneously all observational constraints except the observationally inferred companion mass, consists of a ~13 solar masses black hole and a ~54 solar masses companion star. We conclude that a star with the observed mass and luminosity can not be explained via single star evolution models, and that a prior interaction between the companion star and the black hole progenitor should be taken into account.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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