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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Suzaku Detection of an Intense X-Ray Flarefrom an A-Type Star, HD 161084
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Suzaku Detection of an Intense X-Ray Flarefrom an A-Type Star, HD 161084

机译：朱雀从A型星HD 161084探测到强烈的X射线耀斑

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摘要

We report on a serendipitous detection of an intense X-ray flare from the Tycho reference source on HD 161084during a Suzaku observation of the galactic center region for~20 ks. The X-ray Imaging Spectrometer recordeda flare from this Al -type dwarf or subgiant star with a flux of ~ 1.4 x 10~(-12)erg s~(-1)cm~(-2)(0.5-10 keV) and a decaytime scale of ~ 0.5 hr. The spectrum is hard with a prominent Fe xxv Ka emission line at 6.7 key, which is explainedby a ~ 5 keV thin-thermal plasma model attenuated by a ~ 1.4 x 10~(21)cm~(-2)extinction. The low extinction, which isconsistent with the optical reddening, indicates that the source is a foreground star toward the galactic center region.Based on a spectroscopic parallax distance of ~530 pc, the peak X-ray luminosity amounts to ~1 x 10~(32)erg s~(-1)(0.5-10 keV). This is much larger than the X-ray luminosity of ordinary late-type main-sequence stars, and the X-rayemission is unattributable to a hidden late-type companion that comprises a wide binary system with the A star. Wediscuss possible nature of HD 161084, and suggest that it is most likely an interacting binary with elevated magneticactivity in the companion, such as the Algol-type system. The flux detected by Suzaku during the burst is ti 100-times larger than the quiescent level measured using the archived XMM-Newton and Chandra data. The large fluxamplification makes this star a unique example among sources of this class.
机译：我们报告了在朱雀观测银河系中心区域约20 ks期间，从第谷号参考源在HD 161084上偶然发现了强烈的X射线耀斑。 X射线成像光谱仪记录了来自此Al型矮星或亚巨星的火星，其光通量约为1.4 x 10〜（-12）erg s〜（-1）cm〜（-2）（0.5-10 keV），衰减时间范围为〜0.5小时。谱图很硬，在6.7键处有一条突出的Fe xxv Ka发射谱线，这是由〜5 keV薄热等离子体模型解释的，该模型被〜1.4 x 10〜（21）cm〜（-2）消光衰减。低消光与光学变红相一致，表明该源是朝向银河系中心区域的前景恒星。基于约530 pc的光谱视差，X射线的峰值发光度约为〜1 x 10〜（ 32）erg s〜（-1）（0.5-10 keV）。这比普通晚型主序列恒星的X射线光度大得多，并且X射线的发射归因于隐藏的晚型伴星，该同伴包括与A星组成的宽双星系统。我们讨论了HD 161084的可能性质，并提出它很可能是伴随分子（例如Algol型系统）中具有增强的磁性的相互作用的二元体。 Suzaku在爆发期间检测到的通量比使用存档的XMM-Newton和Chandra数据测得的静态水平大100倍。大的通量放大使该星成为此类光源中的独特实例。

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