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arXiv 1102.4952astro-ph.HE
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BD +53 $^\circ$ 2790的多波长研究:O9 .5V对应的X射线双星系统4U~2206+54

A multiwavelength approach to BD+53$^\circ$2790: the O9.5V counterpart to the X-ray binary system 4U~2206+54

Pere Blay, Víctor Reglero

摘要:

X射线双星系统4U 2206+54隐藏着许多谜团。其中,令人惊讶的行为,它的两个组成部分:O9.5矮星BD+53 $^\circ$ 2790和一个缓慢旋转的中子星。BD+53 $^\circ$ 2790误导了天文学家,显示它很可能是一颗Be星。然而,更深入的光谱分析和更密集的监测显示,真实的图像有点复杂:a)虽然它显示了星周包层的证据,但它的可观测性质与Be星的典型包层不同。b)与光谱标准和模型的比较表明He可能过量。这将开启将BD+53 $^\circ$ 2790的行为与富氦类恒星联系起来的可能性。c)紫外光谱显示O9.5V恒星的风异常缓慢和密集。d)红外波段的光谱分类表明,该源更可能是超巨星性质,与光学分类相矛盾。e)正在调查是否存在强磁场。BD+53 $^\circ$ 2790是测试恒星结构以及风和进化理论的完美实验室。可观察到的属性,这个源在广泛的光谱波段进行了讨论,并概述了一些解释。

英文摘要:

The X-ray binary system 4U 2206+54 hides many mysteries. Among them, the surprising behavior of both of its components: the O9.5 dwarf star BD+53$^\circ$2790 and a slowly rotating neutron star. BD+53$^\circ$2790 misled the astronomers showing itself very likely as a Be star. However, a deeper spectral analysis and more intense monitoring, revealed that the real picture was a bit more complicated: a) Although it shows evidence of a circumstellar envelope, its observable properties differ from those typical envelopes in Be stars. b) Comparison with spectral standards and models indicates a possible over-abundance in He. This would open the possibility to link the behavior of BD+53$^\circ$2790 to the He-rich class of stars. c) UV spectra shows an abnormally slow and dense wind for an O9.5V star. d) Spectral classification in the IR wavelength region suggest a more likely supergiant nature of the source, in contradiction with the optical classification. e) The presence of an intense magnetic field is under investigation. BD+53$^\circ$2790 stands as a perfect laboratory for testing stellar structure, as well as wind and evolutionary theories. The observable properties of this source in a wide range of spectral bands are discussed, and some interpretations outlined.

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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