Variability of Young Massive Stars in the Galactic Super Star Cluster Westerlund 1

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dc.creatorBonanos, Alceste Z.
dc.date2007-02-23
dc.date2007-03-13
dc.date.accessioned2026-07-07T11:21:13Z
dc.date.available2026-07-07T11:21:13Z
dc.descriptionThis paper presents the first optical variability study of the Westerlund 1 super star cluster in search of massive eclipsing binary systems. A total of 129 new variable stars have been identified, including the discovery of 4 eclipsing binaries that are cluster members, 1 additional candidate, 8 field binaries, 19 field delta Scuti stars, 3 field W UMa eclipsing binaries, 13 other periodic variables and 81 long period or non-periodic variables. These include the known luminous blue variable, the B[e] star, 11 Wolf-Rayet stars, several supergiants, and other reddened stars that are likely members of Westerlund 1. The bright X-ray source corresponding to the Wolf-Rayet star WR77o (B) is found to be a 3.51 day eclipsing binary. The discovery of a reddened detached eclipsing binary system implies the first identification of main-sequence stars in Westerlund 1.
dc.description28 pages, 9 figures, 3 tables; accepted for publication in The Astronomical Journal. Full-resolution version and color image of the cluster are available at http://www.dtm.ciw.edu/bonanos/Westerlund1
dc.identifierhttps://arxiv.org/abs/astro-ph/0702614
dc.identifierhttp://arxiv.org/abs/astro-ph/0702614
dc.identifierAstron.J.133:2696-2708,2007
dc.identifierdoi:10.1086/518093
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194199
dc.subjectAstrophysics
dc.titleVariability of Young Massive Stars in the Galactic Super Star Cluster Westerlund 1
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