Fundamental Parameters of four Massive Eclipsing Binaries in Westerlund 1

Abstract

We present fundamental parameters of 4 massive eclipsing binaries in the young massive cluster Westerlund 1. The goal is to measure accurate masses and radii of their component stars, which provide much needed constraints for evolutionary models of massive stars. Accurate parameters can further be used to determine a dynamical lower limit for the magnetar progenitor and to obtain an independent distance to the cluster. Our results confirm and extend the evidence for a high mass for the progenitor of the magnetar.

2 pages, to appear in the proceedings of the IAUS 282 on "From Interacting Binaries to Exoplanets:Essential Modelling Tools" (Tatranska Lomnica, July 18-22, 2011), Cambridge University Press

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• The very low-mass stellar content of the young supermassive Galactic star cluster Westerlund 1
• A High-Resolution Multiband Survey of Westerlund 2 With the Hubble Space Telescope I: Is the Massive Star Cluster Double?
• The Age of Westerlund 1 Revisited
• The Optical/Near-Infrared Extinction Law In Highly Reddened Regions
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• Inferring the parallax of Westerlund 1 from Gaia DR2
• A VLT/FLAMES survey for massive binaries in Westerlund 1: VIII. Binary Systems and Orbital Parameters
• Characterization of the variability in the O+B eclipsing binary HD 165246
• Cold gas in hot star clusters: the wind from the red supergiant W26 in Westerlund 1
• A deep near-infrared spectroscopic survey of the Scutum-Crux arm for Wolf-Rayet stars
• Accurate fundamental parameters and distance to a massive early-type eclipsing binary in the Danks 2 cluster
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