Show simple item record

dc.contributor.authorChené, André-Nicolaspt_BR
dc.contributor.authorBonatto, Charles Josept_BR
dc.contributor.authorMajaess, Daniel J.pt_BR
dc.contributor.authorBaume, Gustavo Luispt_BR
dc.contributor.authorClarke, J. R. A.pt_BR
dc.contributor.authorKurtev, Radostin Georgievpt_BR
dc.contributor.authorSchnurr, Olivierpt_BR
dc.contributor.authorBouret, Jean-Claudept_BR
dc.contributor.authorCatelan, Márciopt_BR
dc.contributor.authorEmerson, Jim P.pt_BR
dc.contributor.authorFeinstein Baigorri, Carlospt_BR
dc.contributor.authorGeisler, Dougpt_BR
dc.contributor.authorGrijs, Richard dept_BR
dc.contributor.authorHervé, Anthonypt_BR
dc.contributor.authorIvanov, Valentin D.pt_BR
dc.contributor.authorKumar, M. S. N.pt_BR
dc.contributor.authorLucas, Philip W.pt_BR
dc.contributor.authorMahy, Laurentpt_BR
dc.contributor.authorMartins, Fabricept_BR
dc.contributor.authorMauro, Francescopt_BR
dc.contributor.authorMinniti, Dantept_BR
dc.contributor.authorMoni Bidin, Christianpt_BR
dc.date.accessioned2014-08-05T02:07:34Zpt_BR
dc.date.issued2013pt_BR
dc.identifier.issn0004-6361pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/99088pt_BR
dc.description.abstractContext. 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 JHKs 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 × 10³ Mʘ) clusters. They are highly obscured (AV ~ 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 Mʘ 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
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofAstronomy and astrophysics. Les Ulis. Vol. 549 (Jan. 2013), A98, 17 p.pt_BR
dc.rightsOpen Accessen
dc.subjectOpen clusters and associations: generalen
dc.subjectAglomerados estelarespt_BR
dc.subjectSurveysen
dc.subjectEstrelas supergigantespt_BR
dc.subjectGaláxiaspt_BR
dc.subjectStars: massiveen
dc.subjectStars: Wolf-Rayeten
dc.subjectAstronomia infravermelhapt_BR
dc.subjectInfrared: starsen
dc.titleMassive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet starspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000919754pt_BR
dc.type.originEstrangeiropt_BR


Files in this item

Thumbnail
   

This item is licensed under a Creative Commons License

Show simple item record