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Massive open star clusters using the VVV survey III. A young massive cluster at the far edge of the Galactic bar

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Massive open star clusters using the VVV survey III. A young massive cluster at the far edge of the Galactic bar

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Título Massive open star clusters using the VVV survey III. A young massive cluster at the far edge of the Galactic bar
Autor Ramírez Alegría, Sebastián
Borissova, Jura
Chené, André-Nicolas
O'Leary, E.
Amigo, Pia
Minniti, Dante
Saito, Roberto K.
Geisler, Doug
Kurtev, Radostin Georgiev
Hempel, Maren
Gromadzki, Mariusz
Clarke, J. R. A.
Negueruela Díez, Ignacio
Marco Tobarra, Amparo
Fierro, C.
Bonatto, Charles Jose
Catelan, Márcio
Abstract Context. Young massive clusters are key to map the Milky Way’s structure, and near-infrared large area sky surveys have contributed strongly to the discovery of new obscured massive stellar clusters. Aims. We present the third article in a series of papers focused on young and massive clusters discovered in the VVV survey. This article is dedicated to the physical characterization of VVVCL086, using part of its OB-stellar population. Methods. We physically characterized the cluster using JHKS near-infrared photometry from ESO public survey VVV images, using the VVV-SkZ pipeline, and near-infrared K-band spectroscopy, following the methodology presented in the first article of the series. Results. Individual distances for two observed stars indicate that the cluster is located at the far edge of the Galactic bar. These stars, which are probable cluster members from the statistically field-star decontaminated CMD, have spectral types between O9 and B0V. According to our analysis, this young cluster (1.0 Myr < age < 5.0 Myr) is located at a distance of 11+5 −6 kpc, and we estimate a lower limit for the cluster total mass of (2.8+1.6 −1.4) · 103 M๏. It is likely that the cluster contains even earlier and more massive stars.
Contido em Astronomy and astrophysics. Les Ulis. Vol. 564 (Apr. 2014), L9, 4 p.
Assunto Aglomerados estelares
Astronomia infravermelha
Fotometria estelar
[en] Galaxy: disk
[en] Open clusters and associations: individual: VVV CL086
[en] Stars: early-type
[en] Stars: massive
[en] Techniques: photometric
[en] Techniques: spectroscopic
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/117306
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