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Title:
GLIMPSE23 - another obscured cluster hosting Wolf-Rayet stars.
Authors:
Kurtev, R.; Borissova, J.; Georgiev, L.; Ivanov, V. D.
Affiliation:
AA(Departamento de Fisica y Astronomia, Facultad de Ciencias, Universidad de Valparaiso, Ave. Gran Bretana 1111, Playa Ancha, Casilla 5030, Valparaiso, Chile; ), AB(Departamento de Fisica y Astronomia, Facultad de Ciencias, Universidad de Valparaiso, Ave. Gran Bretana 1111, Playa Ancha, Casilla 5030, Valparaiso, Chile; ), AC(Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Apartado Postal 70-254, CD Universitaria, CP 04510 Mexico DF, Mexico; ) AD(European Southern Observatory, Av. Alonso de Cordoba 3107, Casilla 19, Santiago 19001, Chile; ),
Publication:
VI Reunion Anual Sociedad Chilena de Astronomia (SOCHIAS), held in Valparaiso, Chile, 7 - 9 November 2007, p. 71.
Publication Date:
00/2007
Origin:
AUTHOR
Keywords:
Galaxy: open clusters and associations: general, Infrared: Infrared: stars, Stars: formation, early-type
Bibliographic Code:
2007soch.conf...71K

Abstract

Young massive clusters represent excellent astrophysical laboratories for the 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. GLIMPSE23 (G23) is one of these clusters. It is situated near the Galactic plane (l=53.772deg, b=+0.164) and we determine its physical parameters and investigate its high-mass stellar content especially WR stars. Our analysis is based on Baade/PANIC JHK imaging and SOFI/NTT low resolution (R~2000) spectroscopy of the brightest cluster members in the K atmospheric window. We derived stellar parameters of the WR stars candidates using a full nonLTE modeling of the observed spectra. We found that G23 is very young cluster, with age t=3-4Myr. The cluster is located in the Sagittarius spiral arm and suffers reddening of Av~7.4+-0.9mag. The distance to the object is d=5.8+-0.5kpc. The spectral analysis and the models allow us to conclude that at least two WR stars can be found in G23. The WR stars are of the WN7-8 type. G23 is a new member of the family of young Galactic clusters hosting WR stars. This investigation is supported by DIPUV 36/2006.
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