CSS J134052 .0+151341：一颗次级恒星剥离演化的激变双星
CSS J134052.0+151341 : A Cataclysmic Binary Star with a Stripped, Evolved Secondary
摘要：
我报告的光谱和时间序列测光的激变二进制CSS J134052.0+151341。可见光主要由第二颗恒星所控制，我将其归类为K4（+-2子类），但从吸收径向速度导出的轨道周期仅为2.45 hr，这意味着罗氏半径太小，无法包含主序星K。光谱显示在几条谱线中增强的钠吸收，表明表面材料已在高温下处理。CSS J134052.0+151341似乎是一个罕见的激变双星，其中的次级恒星是一颗质量更大的恒星的剥离核心，在核心的大部分核演化发生后开始质量转移。
英文摘要：
I report spectroscopy and time-series photometry of the cataclysmic binary CSS J134052.0+151341. The optical light is dominated by the secondary star, which I classify as K4 (+-2 subclasses), yet the orbital period derived from the absorption radial velocities is only 2.45 hr, implying a Roche radius much too small to contain a main-sequence K star. The spectrum shows enhanced sodium absorption in several lines, suggesting that the surface material has been processed at high temperatures. CSS J134052.0+151341 appears to be a rare example of a cataclysmic binary in which the secondary star is the stripped core of a formerly much more massive star, that began mass transfer after much of the core's nuclear evolution had taken place.
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