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arXiv 1809.05623astro-ph.SRastro-ph.IM
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从椭球变差约束低质量白矮星双星

Constraining Low-Mass White Dwarf Binaries from Ellipsoidal Variations

K. J. Bell, J. J. Hermes, J. S. Kuszlewicz

摘要:

恒星在紧密双星中被潮汐相互作用拉伸,并且它们投影面积的变化会在每个轨道上引入两次光度变化。Hermes等人(2014,ApJ,792,39)利用这些椭球变化的测量来限制八个单线光谱双星中低质量白矮星的半径。我们完善这种方法在这里,使用蒙特卡罗模拟,以改善许多轨道和恒星的性质,表现出椭球变化的二元系统的约束。我们详细分析了最近发现的潮汐畸变白矮星双星系统SDSS J1054-2121,并重新访问了Hermes等人。在某些情况下的意见,椭球变化模型和盖亚半径约束之间的分歧表明,外在的错误是存在的,可能是在表面重力通过模型大气适合恒星光谱。

英文摘要:

Stars are stretched by tidal interactions in tight binaries, and changes to their projected areas introduce photometric variations twice per orbit. Hermes et al. (2014, ApJ, 792, 39) utilized measurements of these ellipsoidal variations to constrain the radii of low-mass white dwarfs in eight single-lined spectroscopic binaries. We refine this method here, using Monte Carlo simulations to improve constraints on many orbital and stellar properties of binary systems that exhibit ellipsoidal variations. We analyze the recently discovered tidally distorted white dwarf binary system SDSS J1054-2121 in detail, and also revisit the Hermes et al. (2014) sample. Disagreements in some cases between the observations, ellipsoidal variation model, and Gaia radius constraints suggest that extrinsic errors are present, likely in the surface gravities determined through model atmosphere fits to stellar spectra.

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