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

Дата и время публикации : 2013-03-29T10:04:33Z

Авторы публикации и институты :
M. Rozyczka
J. Kaluzny
I. B. Thompson
S. M. Rucinski
W. Pych
W. Krzeminski

Ссылка на журнал-издание: Acta Astronomica,63,67-78,2013
Коментарии к cтатье: 14 pages, 5 figures, accepted by Acta Astronomica
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: 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.

Category: Physics