Period change of massive binaries from combined photometric and spectroscopic data in Cygnus OB2

Abstract

Context. Mass loss is an important property in evolution models of massive stars. As up to 90% of the massive stars have a visual or spectroscopic companion and many of them exhibit mass exchange, mass-loss rates can be acquired through the period study of massive binaries. Aims. Using our own photometric observations as well as archival data, we look for variations in orbital periods of seven massive eclipsing binary systems in the Cygnus OB2 association and estimate their mass-loss rates and stellar parameters. Methods. We use a Bayesian parameter estimation method to simultaneously fit the period and period change to all available data and a stellar modelling tool to model the binary parameters from photometric and radial-velocity data. Results. Four out of the seven selected binaries show non-zero period change values at two-sigma confidence level. We also report for the first time the eclipsing nature of a star MT059.

12 pages, 18 figures, accepted for publication in A&A

References in corpus (7)

• Binary interaction dominates the evolution of massive stars
• The High Angular Resolution Multiplicity of Massive Stars
• Toward Complete Statistics of Massive Binary Stars: Penultimate Results from the Cygnus OB2 Radial Velocity Survey
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Cited by in corpus (4)

• The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 additional O-type systems
• MONOS.II. Orbit review and analysis for 35 single-lined spectroscopic binary systems and candidates
• Variability survey of brightest stars in selected OB associations
• Quest for the tertiary component in Cyg OB2 #5