Article (Scientific journals)
Massive open star clusters using the VVV survey. II. Discovery of six clusters with Wolf-Rayet stars
Chené, A.-N.; Borissova, J.; Bonatto, C. et al.
2013In Astronomy and Astrophysics, 549
Peer Reviewed verified by ORBi
 

Files


Full Text
aa20107-12.pdf
Publisher postprint (2.26 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
open clusters and associations: general; surveys; stars: massive; stars: Wolf-Rayet; infrared: stars
Abstract :
[en] 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. <BR /> 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. <BR /> 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. <BR /> 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[SUB]⊙[/SUB]) 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[SUB]⊙[/SUB] 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. Based on observations with ISAAC, VLT, ESO (programme 087.D-0341A), New Technology Telescope at ESO's La Silla Observatory (programme 087.D-0490A) and with the Clay telescope at the Las Campanas Observatory (programme CN2011A-086). Also based on data from the VVV survey (programme 172.B-2002).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Chené, A.-N.;  Departamento de Física y AstronomíaUniversidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, 5030, Casilla, Chile ; Departamento de Astronomía, Universidad de Concepción, Casilla 160, Chile
Borissova, J.;  Departamento de Física y AstronomíaUniversidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, 5030, Casilla, Chile ; The Milky Way Millennium Nucleus, Av. Vicuña Mackenna 4860, 782-0436, Macul, Santiago, Chile
Bonatto, C.;  Universidade Federal do Rio Grande do Sul, Departamento de Astronomia, CP 15051, RS, 91501-970, Porto Alegre, Brazil
Majaess, D. J.;  Saint Mary's University, Halifax, Nova Scotia, Canada
Baume, G.;  Facultad de Ciencias Astronómicas y Geofísicas (UNLP), Instituto de Astrofísica de La Plata (CONICET, UNLP), Paseo del Bosque s/n, La Plata, Argentina
Clarke, J. R. A.;  Departamento de Física y AstronomíaUniversidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, 5030, Casilla, Chile ; The Milky Way Millennium Nucleus, Av. Vicuña Mackenna 4860, 782-0436, Macul, Santiago, Chile ; University of Hertfordshire, Hatfield, AL10 9AB, UK
Kurtev, R.;  Departamento de Física y AstronomíaUniversidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, 5030, Casilla, Chile
Schnurr, O.;  Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482, Potsdam, Germany
Bouret, J.-C.;  Laboratoire d'Astrophysique de Marseille - LAM, Université d'Aix-Marseille, CNRS, UMR 7326, 38 rue F. Joliot-Curie, 13388, Marseille Cedex 13, France
Catelan, M.;  The Milky Way Millennium Nucleus, Av. Vicuña Mackenna 4860, 782-0436, Macul, Santiago, Chile ; Pontificia Universidad Católica de Chile, Facultad de Física, Departamento de Astronomía y Astrofísica, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
Emerson, J. P.;  School of Physics and Astronomy, Queen Mary University of London, London, E1 4NS, UK
Feinstein, C.;  Facultad de Ciencias Astronómicas y Geofísicas (UNLP), Instituto de Astrofísica de La Plata (CONICET, UNLP), Paseo del Bosque s/n, La Plata, Argentina
Geisler, D.;  Departamento de Astronomía, Universidad de Concepción, Casilla 160, Chile
de Grijs, R.;  Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Hai Dian District, 100871, Beijing, PR China
Hervé, A.;  Groupe d'Astrophysique des Hautes Énergies, Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, Batiment B5c, 4000, Liège, Belgium
Ivanov, V. D.;  European Southern Observatory, Ave. Alonso de Cordova 3107, Casilla 19, Chile
Kumar, M. S. N.;  Centro de Astrofisica da Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal
Lucas, P.;  University of Hertfordshire, Hatfield, AL10 9AB, UK
Mahy, Laurent ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Martins, F.;  LUPM-UMR 5299, CNRS, Université Montpellier II, Place Eugène Bataillon, 34095, Montpellier Cedex 05, France
Mauro, F.;  Departamento de Astronomía, Universidad de Concepción, Casilla 160, Chile
Minniti, D.;  The Milky Way Millennium Nucleus, Av. Vicuña Mackenna 4860, 782-0436, Macul, Santiago, Chile ; Pontificia Universidad Católica de Chile, Facultad de Física, Departamento de Astronomía y Astrofísica, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile ; Vatican Observatory, V 00120, Vatican City State, Italy ; Department of Astrophysical Sciences, Princeton University, Princeton, NJ, 08544-1001, USA
Moni Bidin, C.;  Departamento de Astronomía, Universidad de Concepción, Casilla 160, Chile ; The Milky Way Millennium Nucleus, Av. Vicuña Mackenna 4860, 782-0436, Macul, Santiago, Chile)
More authors (13 more) Less
Language :
English
Title :
Massive open star clusters using the VVV survey. II. Discovery of six clusters with Wolf-Rayet stars
Publication date :
01 January 2013
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
549
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 January 2019

Statistics


Number of views
23 (1 by ULiège)
Number of downloads
21 (0 by ULiège)

Scopus citations®
 
31
Scopus citations®
without self-citations
10
OpenCitations
 
30

Bibliography


Similar publications



Contact ORBi