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

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...

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Detalles Bibliográficos
Autores principales: Baume, Gustavo Luis, Feinstein Baigorri, Carlos
Formato: Articulo Revision
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Astronómicas
Infrared: stars
Open clusters and associations: general
Stars: massive
Stars: Wolf-Rayet
Surveys
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85245
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85245
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Infrared: stars
Open clusters and associations: general
Stars: massive
Stars: Wolf-Rayet
Surveys
spellingShingle Ciencias Astronómicas
Infrared: stars
Open clusters and associations: general
Stars: massive
Stars: Wolf-Rayet
Surveys
Baume, Gustavo Luis
Feinstein Baigorri, Carlos
Massive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet stars
topic_facet Ciencias Astronómicas
Infrared: stars
Open clusters and associations: general
Stars: massive
Stars: Wolf-Rayet
Surveys
description 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<SUB>s</SUB> 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<SUP>3</SUP> M⊙) clusters. They are highly obscured (A<SUB>V</SUB> ∼ 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⊙ 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.
format Articulo
Revision
author Baume, Gustavo Luis
Feinstein Baigorri, Carlos
author_facet Baume, Gustavo Luis
Feinstein Baigorri, Carlos
author_sort Baume, Gustavo Luis
title Massive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet stars
title_short Massive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet stars
title_full Massive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet stars
title_fullStr Massive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet stars
title_full_unstemmed Massive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet stars
title_sort massive open star clusters using the vvv survey : ii. discovery of six clusters with wolf-rayet stars
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85245
work_keys_str_mv AT baumegustavoluis massiveopenstarclustersusingthevvvsurveyiidiscoveryofsixclusterswithwolfrayetstars
AT feinsteinbaigorricarlos massiveopenstarclustersusingthevvvsurveyiidiscoveryofsixclusterswithwolfrayetstars
bdutipo_str Repositorios
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