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arXiv 1401.1503astro-ph.SR
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食双星CSS 41177中两颗白矮星的精确参数

Precise parameters for both white dwarfs in the eclipsing binary CSS 41177

M. C. P. Bours, T. R. Marsh, S. G. Parsons, C. M. Copperwheat, V. S. Dhillon, S. P. Littlefair, B. T. Gänsicke, A. Gianninas, P. -E. Tremblay

摘要:

我们目前的ULTRACAM测光和X-射手光谱的食双白矮星二进制CSS 41177,唯一这样的系统,也是一个双线光谱二进制。结合光变曲线和径向速度的模型可以得到两颗白矮星的质量和半径,而不需要假设质量-半径关系。我们发现主白矮星的质量为M1 = 0.38(2)Msun,半径为R1 = 0.0222(4)Rsun。次级白矮星的质量和半径分别为M2 = 0.32(1)Msun和R2 = 0.0207(4)Rsun,其温度和表面重力(T2 = 11678(313)K,log(g2)= 7.32(2))使其接近于白矮星不稳定带。然而,我们没有发现相对振幅约为0.5%的脉动的证据。质量和半径都与氦白矮星模型一致,其薄氢包层为0.0001 M星。由于引力波发射造成的角动量损失,这两颗恒星将在1.14 Gyr合并。

英文摘要:

We present ULTRACAM photometry and X-Shooter spectroscopy of the eclipsing double white dwarf binary CSS 41177, the only such system that is also a double-lined spectroscopic binary. Combined modelling of the light curves and radial velocities yield masses and radii for both white dwarfs without the need to assume mass-radius relations. We find that the primary white dwarf has a mass of M1 = 0.38(2) Msun and a radius of R1 = 0.0222(4) Rsun. The secondary white dwarf's mass and radius are M2 = 0.32(1) Msun and R2 = 0.0207(4) Rsun, and its temperature and surface gravity (T2 = 11678(313) K, log(g2) = 7.32(2)) put it close to the white dwarf instability strip. However, we find no evidence for pulsations to roughly 0.5% relative amplitude. Both masses and radii are consistent with helium white dwarf models with thin hydrogen envelopes of 0.0001 Mstar. The two stars will merge in 1.14 Gyr due to angular momentum loss via gravitational wave emission.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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