arXiv 1209.02902012-09-03astro-ph.SR

近接触双星天鹅座KR的长期光度和光谱观测

Long-term photometric and spectroscopic observations of the near-contact binary KR Cygni

E. Sipahi, O. Cakirli, C. Ibanoglu

备注：: Accepted. 18 pages, 7 figures; 2012, October, Rev. Mex

摘要：

本文给出了近接触双星KR Cyg的多色五年光变曲线和第一视向速度。我们推导出组分的质量为2.88 $\pm$ 0.20 M $_{\odot}$和1.26 $\pm$ 0.07 M $_{\odot}$，半径为2.59 $\pm$ 0.06 R $_{\odot}$和1.80 $\pm$ 0.04 R $_{\odot}$。UBVR光变曲线和径向速度的分析表明，没有一个组件完全填充其相应的洛希瓣。利用观测到的UBV视星等和分量星的热辐射改正，我们计算了到天鹅座KR系统的距离为{411 $\pm$ 12} pc。我们还搜索了经验测定的温度和有效温度的冷却器，质量较小的恒星KR天鹅座，和两个类似的近接触双星AK CMi，和DO Cas。观测到的和计算的通量之间的残差归因于相互照明的效果，加热被照射的恒星的表面层，并不改变不仅其测辐射热辐射，而且其边缘变暗系数和重力增亮指数。光变曲线的分析表明，对流星的有效散射度一般都小于理论值，在B通带处与理论值相差很大。当反射光减少时，有效温度会增加，因此，被照射恒星的光度会增加。观察到的蓝色U-B颜色在小学期间最低归因于相互照射和多重散射过程，这可能会改变这些系统的几个特性的影响。

英文摘要：

We present the multi-color, five-year light curves and the first radial velocities of the near-contact binary system KR Cyg. We derived the masses of the components as 2.88$\pm$0.20 M$_{\odot}$ and 1.26$\pm$0.07 M$_{\odot}$ and the radii as 2.59$\pm$0.06 R$_{\odot}$ and 1.80$\pm$0.04 R$_{\odot}$. Analyses of the UBVR light curves and the radial velocities indicate that none of the components exactly fill their corresponding Roche lobes. We have calculated the distance to the system of KR Cyg as {411$\pm$12} pc using the observed apparent UBV magnitudes and the bolometric corrections for the component stars. We also searched for the empirical determination of albedo and effective temperature of the cooler, less massive star of KR Cyg, and of two similar near contact binaries AK CMi, and DO Cas. The residuals between the observed and computed fluxes are attributed to the effect of mutual illumination which heats the surface layers of the illuminated star and does vary not only its bolometric albedo but also its limb-darkening coefficient and gravity-brightening exponent. The analysis of the light curves shows that the effective albedos are generally smaller than that expected from an envelope of convective star, being mostly departed from the theoretical value at the B passband. As the reflected light diminishes the effective temperature and, therefore, the luminosity of the irradiated star increase. The observed bluer U-B colors during primary minimum are attributed to the effects of mutual irradiation and multiple scattering processes which may alter several characteristics of these systems.

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。

摘要：

英文摘要：

相关论文