MACHO 311.37557.169：一颗VY Scl星
MACHO 311.37557.169: A VY Scl star
摘要：
光学巡天，如OOO项目，经常发现变星，其分类需要其他仪器的后续观测。我们在2018年4月用\XMM \对不寻常的变星O311.37557.169进行了X射线光谱学和测光，并补充了存档的X射线和光谱数据。这颗恒星的X射线辐射热光度约为$1\times 10^{32}$ erg s $^{-1}$ cm $^{-2}$，并有大量吸收的双温等离子体光谱。光变曲线的形状、总亮度、X射线光谱和光谱中的发射线都表明它很可能是一颗VY~Scl激变变星。
英文摘要：
Optical surveys, such as the MACHO project, often uncover variable stars whose classification requires followup observations by other instruments. We performed X-ray spectroscopy and photometry of the unusual variable star MACHO 311.37557.169 with \XMM\ in April 2018, supplemented by archival X-ray and optical spectrographic data. The star has a bolometric X-ray luminosity of about $1\times 10^{32}$ erg s$^{-1}$ cm$^{-2}$ and a heavily absorbed two-temperature plasma spectrum. The shape of its light curve, its overall brightness, its X-ray spectrum, and the emission lines in its optical spectrum suggest that it is most likely a VY~Scl cataclysmic variable.
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