arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1406.2865astro-ph.SR
收藏

开普勒场中食CV的参数研究,KIS J192748 .53+444724.5

A parameter study of the eclipsing CV in the Kepler field, KIS J192748.53+444724.5

S. P. Littlefair, V. S. Dhillon, B. T Gaensicke, M. C. P. Bours, C. M. Copperwheat, T. R. Marsh

摘要:

本文介绍了位于开普勒场中的食矮星新星KIS J192748.53+444724.5的高速三色测光。我们的数据揭示了与吸积白矮星的食相对应的鲜明特征,随后是气体流加入吸积盘的亮点。我们通过一个参数化的日食模型拟合到所观察到的光变曲线来确定系统参数。我们得到的质量比为q = 0.570 +/- 0.011,轨道倾角为84.6 +/- 0.3度。初始质量为M_w = 0.69 +/- 0.07 Msun。施主星的质量和半径分别为M_d = 0.39 +/- 0.04 Msun和R_d = 0.43 +/- 0.01 Rsun。从白矮星食的通量中,我们发现白矮星的温度为T_w = 23000 +/- 3000 K,到系统的测光距离为1600 +/- 200 pc,忽略星际变红的影响。KISJ 1927中的白矮星温度意味着白矮星以Mdot =(1.4 +/- 0.8)x10 e-9 Msun/yr的平均速率吸积,与施主长期质量损失速率的估计一致。

英文摘要:

We present high-speed, three-colour photometry of the eclipsing dwarf nova KIS J192748.53+444724.5 which is located in the Kepler field. Our data reveal sharp features corresponding to the eclipses of the accreting white dwarf followed by the bright spot where the gas stream joins the accretion disc. We determine the system parameters via a parameterized model of the eclipse fitted to the observed lightcurve. We obtain a mass ratio of q = 0.570 +/- 0.011 and an orbital inclination of 84.6 +/- 0.3 degrees. The primary mass is M_w = 0.69 +/- 0.07 Msun. The donor star's mass and radius are found to be M_d = 0.39 +/- 0.04 Msun and R_d = 0.43 +/- 0.01 Rsun, respectively. From the fluxes of the white dwarf eclipse we find a white dwarf temperature of T_w = 23000 +/- 3000 K, and a photometric distance to the system of 1600 +/- 200 pc, neglecting the effects of interstellar reddening. The white dwarf temperature in KISJ1927 implies the white dwarf is accreting at an average rate of Mdot = (1.4 +/- 0.8) x10e-9 Msun/yr, in agreement with estimates of the secular mass loss rate from the donor.

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。

↑