Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-18
Astronomy and Astrophysics
Astrophysics
11 pages, 9 figures, accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20066706
Young massive clusters are perfect astrophysical laboratories for study of massive stars. Clusters with Wolf-Rayet (WR) stars are of special importance, since this enables us to study a coeval WR population at a uniform metallicity and known age. GLIMPSE30 (G30) is one of them. The cluster is situated near the Galactic plane (l=298.756deg, b=-0.408deg) and we aimed to determine its physical parameters and to investigate its high-mass stellar content and especially WR stars. Our analysis is based on SOFI/NTT JsHKs imaging and low resolution (R~2000) spectroscopy of the brightest cluster members in the K atmospheric window. For the age determination we applied isochrone fits for MS and Pre-MS stars. We derived stellar parameters of the WR stars candidates using a full nonLTE modeling of the observed spectra. Using a variety of techniques we found that G30 is very young cluster, with age t~4Myr. The cluster is located in Carina spiral arm, it is deeply embedded in dust and suffers reddening of Av~10.5+-1.1mag. The distance to the object is d=7.2+-0.9kpc. The mass of the cluster members down to 2.35Msol is ~1600Msol. Cluster's MF for the mass range of 5.6 to 31.6Msol shows a slope of Gamma=-1.01+-0.03. The total mass of the cluster obtained by this MF down to 1Msol is about 3x10^3Msol. The spectral analysis and the models allow us to conclude that in G30 are at least one Ofpe/WN and two WR stars. The WR stars are of WN6-7 hydrogen rich type with progenitor masses more than 60Msol. G30 is a new member of the exquisite family of young Galactic clusters, hosting WR stars. It is a factor of two to three less massive than some of the youngest super-massive star clusters like Arches, Quintuplet and Central cluster and is their smaller analog.
Borissova Jordanka
Georgiev Lachezar
Ivanov Valentin Dimitrov
Kurtev Radostin
Ortolani Sergio
No associations
LandOfFree
Obscured clusters.I. GLIMPSE30 - Young Milky Way Star Cluster Hosting Wolf-Rayet Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Obscured clusters.I. GLIMPSE30 - Young Milky Way Star Cluster Hosting Wolf-Rayet Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Obscured clusters.I. GLIMPSE30 - Young Milky Way Star Cluster Hosting Wolf-Rayet Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-329588