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arXiv 1402.0322astro-ph.SR
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短周期极限附近两颗低质量接触食双星的参数

Parameters of two low-mass contact eclipsing binaries near the short-period limit

M. E. Lohr, S. T. Hodgkin, A. J. Norton, U. C. Kolb

摘要:

两个天体1 SWASP J150822.80-054236.9和1 SWASP J160156.04+202821.6最初是从它们的SuperWASP存档光变曲线中检测到的,它们是候选的食双星,其周期接近主序星双星轨道周期分布的短周期截止点,大约在0.2 d。在这里,使用INT光谱数据,我们确认他们作为双线光谱和食双星,在接触配置。根据它们的可见光变曲线和径向速度曲线的建模,我们确定了它们的组件和系统参数,精度在~2和11%之间。前者包含1.07和0.55Msun分量,半径分别为0.90和0.68Rsun,其主星表现出周期为系统轨道周期1/6的脉动。后者包含0.86和0.57 M_sun分量,半径分别为0.75和0.63 R_sun。

英文摘要:

The two objects 1SWASP J150822.80-054236.9 and 1SWASP J160156.04+202821.6 were initially detected from their SuperWASP archived light curves as candidate eclipsing binaries with periods close to the short-period cut-off of the orbital period distribution of main sequence binaries, at ~0.2 d. Here, using INT spectroscopic data, we confirm them as double-lined spectroscopic and eclipsing binaries, in contact configuration. Following modelling of their visual light curves and radial velocity curves, we determine their component and system parameters to precisions between ~2 and 11%. The former system contains 1.07 and 0.55 M_sun components, with radii of 0.90 and 0.68 R_sun respectively; its primary exhibits pulsations with period 1/6 the orbital period of the system. The latter contains 0.86 and 0.57 M_sun components, with radii of 0.75 and 0.63R_sun respectively.

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