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Obscured clusters: III. Follow-up observations of Mercer 23

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Autor Hanson M.M.
Autor Kurtev R.
Autor Borissova J.
Autor Georgiev L.
Autor Ivanov V.D.
Autor Hillier D.J.
Autor Minniti D.
Fecha Ingreso 2014-04-05T00:16:40Z
Fecha Disponible 2014-04-05T00:16:40Z
Fecha en Repositorio 2014-04-04
dc.description.abstract Context. New infrared surveys have revealed over 1000 new open cluster candidates in the Milky Way, but these candidates need to be confirmed with follow up observations. Of particular interest are young, massive star clusters because they serve as nearby analogues to the distant super star clusters studied as point sources in other galaxies. Aims. We determine the physical parameters and investigate the high-mass stellar content of the infrared star cluster Mercer 23, situated near the Galactic plane (l = 53772, b = +164). Methods. Our analysis is based on new Baade/PANIC JHKS and ISAAC/VLT imaging of Mercer 23 and ISAAC/VLT moderate resolution (R≈4000) spectroscopy of the brightest cluster members in the H-and K-bands. The cluster age is determined from isochrone main-sequence (MS) and pre-MS fitting. We derive stellar parameters for eight of the stellar members, using a full non-LTE modeling of the obtained spectra. Results. Mercer 23 is a very young cluster, with age of t = 2-4 Myr. The cluster suffers reddening of E(J-K S)=1.35, AV =7.2 mag. The derived distance is d = 6.5±0.3 kpc. Our spectral modeling allows us to conclude that the three most luminous member are evolved highly massive stars: a WR star, and two mid-O supergiant stars, based on their derived luminosity. Conclusions. Mercer‰23 is not a super-massive cluster such as those recently recognized to exist in the Milky Way. However, its mass estimate of 4-6×103 ⊙ and possibly more, puts it in the class of young Galactic clusters hosting WR stars. © 2010 ESO. en_US
dc.source Astronomy and Astrophysics
Link Descarga dc.source.uri
Title dc.title Obscured clusters: III. Follow-up observations of Mercer 23 en_US
Tipo dc.type Article
dc.description.keywords Follow up; Galactic plane; Galaxy: Open clusters and associations: General; Infrared stars; Isochrones; K-bands; Massive stars; Milky ways; Moderate resolution; Non-LTE; Open clusters; Open clusters and associations:individual; Physical parameters; Point sources; Spectral modeling; Star clusters; Stars: Wolf-Rayet; Stellar content; Stellar parameters; Galaxies; Luminance; Stars en_US

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