• Corpus ID: 117568298

The Clusters AgeS Experiment (CASE): The blue straggler Star M55-V60 caught amidst rapid mass exchange

@article{Rozyczka2013TheCA,
  title={The Clusters AgeS Experiment (CASE): The blue straggler Star M55-V60 caught amidst rapid mass exchange},
  author={M. Rozyczka and Janusz Kaluzny and Ian B. Thompson and S. M. Rucinski and Wojtek Pych and Wojtek Krzemiński},
  journal={arXiv: Solar and Stellar Astrophysics},
  year={2013}
}

• M. Rozyczka, J. Kaluzny, +3 authors W. Krzemiński
• Published 1 March 2013
• Physics
• arXiv: Solar and Stellar Astrophysics

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.