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

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.

preprint2013arXivOpen access
M. RozyczkaJ. KaluznyI. B. ThompsonS. M. RucinskiW. PychW. Krzeminski
astro-ph.SR
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M. RozyczkaJ. KaluznyI. B. ThompsonS. M. RucinskiW. PychW. Krzeminski

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