Massive open star clusters using the VVV survey II. Discovery of six clusters with Wolf-Rayet stars

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dc.creator Majaess, Daniel J.
dc.creator Chene, A.-N.
dc.creator Borissova, J.
dc.creator Bonatto, C.
dc.creator Baume, G.
dc.creator Clarke, J. R. A.
dc.creator Kurtev, R.
dc.creator Schnurr, O.
dc.creator Bouret, J.-C.
dc.creator Catelan, M.
dc.date.accessioned 2015-07-27T14:58:24Z
dc.date.available 2015-07-27T14:58:24Z
dc.date.issued 2013-01
dc.identifier.issn 0004-6361
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/26263
dc.description Publisher's version/PDF en_CA
dc.description.abstract Context. The ESO Public Survey “VISTA Variables in the Vía Láctea” (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Nearly 150 new open clusters and cluster candidates have been discovered in this survey. Aims. This is the second in a series of papers about young, massive open clusters observed using the VVV survey. We present the first study of six recently discovered clusters. These clusters contain at least one newly discovered Wolf-Rayet (WR) star. Methods. Following the methodology presented in the first paper of the series, wide-field, deep JHK[subscript s] VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters. Results. We find that the six studied stellar groups are real young (2–7 Myr) and massive (between 0.8 and 2.2 × 10[superscript 3] M[subscript circled dot]) clusters. They are highly obscured (A[subscript V] ∼ 5−24 mag) and compact (1–2 pc). In addition to WR stars, two of the six clusters also contain at least one red supergiant star, and one of these two clusters also contains a blue supergiant. We claim the discovery of 8 new WR stars, and 3 stars showing WR-like emission lines which could be classified WR or OIf. Preliminary analysis provides initial masses of ∼30–50 M[subscript circled dot] for the WR stars. Finally, we discuss the spiral structure of the Galaxy using the six new clusters as tracers, together with the previously studied VVV clusters. en_CA
dc.language.iso en en_CA
dc.publisher EDP Sciences for European Southern Observatory en_CA
dc.relation.uri http://dx.doi.org/10.1051/0004-6361/201220107
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Stars -- Open clusters
dc.subject.lcsh Wolf-Rayet stars
dc.subject.lcsh Supergiant stars
dc.title Massive open star clusters using the VVV survey II. Discovery of six clusters with Wolf-Rayet stars en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astronomy & Astrophysics 549, A98. (2013) en_CA


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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: http://dx.doi.org/10.1051/0004-6361/201220107
 
 

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