星团AgeS实验（CASE）：在快速质量交换中捕获的蓝色离散星M55-V60
The Clusters AgeS Experiment (CASE): The blue straggler Star M55-V60 caught amidst rapid mass exchange
摘要：
本文分析了球状星团M55场中食蓝离散星V60的光变和速度曲线。我们推导出初级的Mp=1.259+-0.025 Msun，Rp=1.102+-0.021 Rsun，Mbol，p=3.03+-0.09 mag;次级的Ms=0.327+-0.017 Msun，Rs=1.480+-0.011 Rsun，Mbol，s=4.18+-0.12 mag。我们导出了一个视距离模（m-M）V=14.04_-0.09 mag.根据V60的系统速度、距离和自行，我们得出该系统是星团的一员的结论，并认为它目前的状态是双星仍在进行的快速但保守的质量交换的结果.我们报告了一个特殊的蓝色过剩的上升支的初级食的V60，并讨论了其可能的起源。
英文摘要：
We analyze light and velocity curves of the eclipsing blue straggler V60 in the field of the globular cluster M55. We derive Mp=1.259+-0.025 Msun, Rp=1.102+-0.021 Rsun, Mbol,p=3.03+-0.09 mag for the primary and Ms=0.327+-0.017 Msun, Rs=1.480+-0.011 Rsun, Mbol,s=4.18+-0.12 mag for the secondary. We derive an apparent distance modulus (m-M)V=14.04_-0.09 mag. Based on the systemic velocity, distance, and proper motion of V60 we conclude that the system is a member of the cluster and argue that its present state is a result of rapid but conservative mass exchange which the binary is still undergoing. We report a peculiar blue excess on the ascending branch of the primary eclipse of V60 and discuss its possible origin.
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