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

A. N. Chené, J. Borissova, C. Bonatto, D. J. Majaess, G. Baume, J. R.A. Clarke, R. Kurtev, O. Schnurr, J. C. Bouret, M. Catelan, J. P. Emerson, C. Feinstein, D. Geisler, R. De Grijs, A. Hervé, V. D. Ivanov, M. S.N. Kumar, P. Lucas, L. Mahy, F. MartinsF. Mauro, D. Minniti, C. Moni Bidin

Research output: Contribution to journalReview article

27 Citations (Scopus)

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 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 M) 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 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.

Original languageEnglish
Article numberA98
JournalAstronomy and Astrophysics
Volume549
DOIs
Publication statusPublished - 14 Jan 2013

Fingerprint

Wolf-Rayet stars
star clusters
infrared spectroscopy
tracer
open clusters
methodology
supergiant stars
galactic bulge
wolves
European Southern Observatory
set theory
tracers
young
time measurement
galaxies

Keywords

  • Infrared: stars
  • Open clusters and associations: general
  • Stars: massive
  • Stars: Wolf-Rayet
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Chené, A. N., Borissova, J., Bonatto, C., Majaess, D. J., Baume, G., Clarke, J. R. A., ... Moni Bidin, C. (2013). Massive open star clusters using the VVV survey: II. Discovery of six clusters with Wolf-Rayet stars. Astronomy and Astrophysics, 549, [A98]. https://doi.org/10.1051/0004-6361/201220107
Chené, A. N. ; Borissova, J. ; Bonatto, C. ; Majaess, D. J. ; Baume, G. ; Clarke, J. R.A. ; Kurtev, R. ; Schnurr, O. ; Bouret, J. C. ; Catelan, M. ; Emerson, J. P. ; Feinstein, C. ; Geisler, D. ; De Grijs, R. ; Hervé, A. ; Ivanov, V. D. ; Kumar, M. S.N. ; Lucas, P. ; Mahy, L. ; Martins, F. ; Mauro, F. ; Minniti, D. ; Moni Bidin, C. / Massive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet stars. In: Astronomy and Astrophysics. 2013 ; Vol. 549.
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title = "Massive open star clusters using the VVV survey: II. Discovery of six clusters with Wolf-Rayet stars",
abstract = "Context. The ESO Public Survey {"}VISTA Variables in the V{\'i}a L{\'a}ctea{"} (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 M™) 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 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.",
keywords = "Infrared: stars, Open clusters and associations: general, Stars: massive, Stars: Wolf-Rayet, Surveys",
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Chené, AN, Borissova, J, Bonatto, C, Majaess, DJ, Baume, G, Clarke, JRA, Kurtev, R, Schnurr, O, Bouret, JC, Catelan, M, Emerson, JP, Feinstein, C, Geisler, D, De Grijs, R, Hervé, A, Ivanov, VD, Kumar, MSN, Lucas, P, Mahy, L, Martins, F, Mauro, F, Minniti, D & Moni Bidin, C 2013, 'Massive open star clusters using the VVV survey: II. Discovery of six clusters with Wolf-Rayet stars', Astronomy and Astrophysics, vol. 549, A98. https://doi.org/10.1051/0004-6361/201220107

Massive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet stars. / Chené, A. N.; Borissova, J.; Bonatto, C.; Majaess, D. J.; Baume, G.; Clarke, J. R.A.; Kurtev, R.; Schnurr, O.; Bouret, J. C.; Catelan, M.; Emerson, J. P.; Feinstein, C.; Geisler, D.; De Grijs, R.; Hervé, A.; Ivanov, V. D.; Kumar, M. S.N.; Lucas, P.; Mahy, L.; Martins, F.; Mauro, F.; Minniti, D.; Moni Bidin, C.

In: Astronomy and Astrophysics, Vol. 549, A98, 14.01.2013.

Research output: Contribution to journalReview article

TY - JOUR

T1 - Massive open star clusters using the VVV survey

T2 - II. Discovery of six clusters with Wolf-Rayet stars

AU - Chené, A. N.

AU - Borissova, J.

AU - Bonatto, C.

AU - Majaess, D. J.

AU - Baume, G.

AU - Clarke, J. R.A.

AU - Kurtev, R.

AU - Schnurr, O.

AU - Bouret, J. C.

AU - Catelan, M.

AU - Emerson, J. P.

AU - Feinstein, C.

AU - Geisler, D.

AU - De Grijs, R.

AU - Hervé, A.

AU - Ivanov, V. D.

AU - Kumar, M. S.N.

AU - Lucas, P.

AU - Mahy, L.

AU - Martins, F.

AU - Mauro, F.

AU - Minniti, D.

AU - Moni Bidin, C.

PY - 2013/1/14

Y1 - 2013/1/14

N2 - 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 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 M™) 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 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.

AB - 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 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 M™) 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 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.

KW - Infrared: stars

KW - Open clusters and associations: general

KW - Stars: massive

KW - Stars: Wolf-Rayet

KW - Surveys

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U2 - 10.1051/0004-6361/201220107

DO - 10.1051/0004-6361/201220107

M3 - Review article

AN - SCOPUS:84872084924

VL - 549

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A98

ER -