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arXiv 1111.6375astro-ph.SRastro-ph.HE
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银河系亮蓝变星的首次X射线巡天

The first X-ray survey of Galactic Luminous Blue Variables

Yael Naze, Gregor Rauw, Damien Hutsemekers

摘要:

目的:研究了大质量恒星在主序星相和沃尔夫-拉叶星相时的X射线发射。然而,过渡的发光蓝可变(LBV)相的X射线属性仍然未知。研究方法:使用专用但有限的XMM调查以及存档XMM和钱德拉观测,我们进行了第一次X射线调查的LBV:大约一半的已知LBV或候选LBV的研究。结果如下:除了众所周知的X射线源eta Car和Cyg OB 2 #12外,在本次调查中还检测到了另外四个LBV,尽管对其中两个与X射线源的关联仍存在一些疑问。对于其他LBV,推导出通量的上限,对于PCyg,低至$\log[L_{\rm X}/L_{\rm BOL}]-9.4$。讨论了X射线发射强度的变化,特别强调了二元性的潜在影响。

英文摘要:

Aims: The X-ray emission of massive stars has been studied when these objects are in their main-sequence phase, as well as in their Wolf-Rayet phase. However, the X-ray properties of the transitional Luminous Blue Variable (LBV) phase remain unknown. Methods: Using a dedicated but limited XMM survey as well as archival XMM and Chandra observations, we performed the first X-ray survey of LBVs: about half of the known LBVs or candidate LBVs are studied. Results: Apart from the well known X-ray sources eta Car and Cyg OB2 #12, four additional LBVs are detected in this survey, though some doubt remains on the association with the X-ray source for two of these. For the other LBVs, upper limits on the flux were derived, down to $\log[L_{\rm X}/L_{\rm BOL}]-9.4$ for PCyg. This variety in the strength of the X-ray emission is discussed, with particular emphasis on the potential influence of binarity.

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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