arXiv 1403.63252014-03-25astro-ph.SR

集群AgeS实验（CASE）。VI。球状星团M55中两个分离食双星的分析

The Clusters AgeS Experiment (CASE). VI. Analysis of two detached eclipsing binaries in the Globular Cluster M55

J. Kaluzny, I. B. Thompson, A. Dotter, M. Rozyczka, W. Pych, S. M. Rucinski, G. S. Burley

备注：: Accepted by Acta Astronomica
发表信息：: Acta Astronomica, 03/2014, vol 64, no 1, p. 11-26

摘要：

本文分析了球状星团M55中的两颗食双星V44和V54。对于V54，我们获得了以下绝对参数：主要的$M_p=0.726\pm 0.015\,M_\odot$、$R_p=1.006\pm 0.009\,R_\odot$、$L_p=1.38\pm 0.07\,L_\odot$，次要的$M_s=0.555\pm 0.008\,M_\odot$、$R_s=0.528\pm 0.005\,R_\odot$、$L_s=0.16\pm0.01\,L_\odot$。V54的年龄和视距离模量估计分别为13.3 - 14.7 Gyr和$13.94\pm0.05$等。这个年龄比我们从47 Tuc和M4的双星系统分析中得出的年龄大得多。由于V44的次级在光域中很弱，因此只能得到该系统各分量的质量函数和相关参数。然而，有一个很好的机会，二次的速度曲线可以从近红外光谱。由于V44的原生代比V54进化得更快，因此这些数据将对M55的年龄和距离施加更严格的限制。

英文摘要：

We present an analysis of the detached eclipsing binaries V44 and V54 belonging to the globular cluster M55. For V54 we obtain the following absolute parameters: $M_p=0.726\pm 0.015\,M_\odot$, $R_p=1.006\pm 0.009\,R_\odot$, $L_p=1.38\pm 0.07\,L_\odot$ for the primary, and $M_s=0.555\pm 0.008\,M_\odot$, $R_s=0.528\pm 0.005\,R_\odot$, $L_s=0.16\pm0.01\,L_\odot$ for the secondary. The age and apparent distance modulus of V54 are estimated at 13.3 - 14.7 Gyr and $13.94\pm0.05$ mag, respectively. This age is substantially larger than ages we have derived from the analysis of binary systems in 47 Tuc and M4. The secondary of V44 is so weak in the optical domain that only mass function and relative parameters are obtained for the components of this system. However, there is a good chance that the velocity curve of the secondary could be derived from near-IR spectra. As the primary of V44 is more evolved than that of V54, such data would impose much tighter limits on the age and distance of M55.

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