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Fundamental parameters of 4 massive eclipsing binaries in Westerlund 1

Published online by Cambridge University Press:  12 July 2011

Eugenia Koumpia  and
Alceste Z. Bonanos
Eugenia Koumpia
Affiliation:
National Observatory of Athens, Institute of Astronomy & Astrophysics, I. Metaxa & Vas. Pavlou St., Palaia Penteli GR-15236 Athens, Greece email: koumpia@astro.noa.gr, bonanos@astro.noa.gr
Alceste Z. Bonanos
Affiliation:
National Observatory of Athens, Institute of Astronomy & Astrophysics, I. Metaxa & Vas. Pavlou St., Palaia Penteli GR-15236 Athens, Greece email: koumpia@astro.noa.gr, bonanos@astro.noa.gr
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Abstract

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Westerlund 1 is one of the most massive young clusters known in the Local Group, with an age of 3-5 Myr. It contains an assortment of rare evolved massive stars, such as blue, yellow and red supergiants, Wolf-Rayet stars, a luminous blue variable, and a magnetar, as well as 4 massive eclipsing binary systems (Wddeb, Wd13, Wd36, WR77o, see Bonanos 2007). The eclipsing binaries present a rare opportunity to constrain evolutionary models of massive stars, the distance to the cluster and furthermore, to determine a dynamical lower limit for the mass of a magnetar progenitor. Wddeb, being a detached system, is of great interest as it allows determination of the masses of 2 of the most massive unevolved stars in the cluster. We have analyzed spectra of all 4 eclipsing binaries, taken in 2007-2008 with the 6.5 meter Magellan telescope at Las Campanas Observatory, Chile, and present fundamental parameters (masses, radii) for their component stars.

Keywords

open clusters and associations: individual (Westerlund 1)stars: fundamental parametersstars: early-typebinaries: eclipsingstars: Wolf-Rayet

References

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