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The WFI Hα spectroscopic survey of the Magellanic Clouds: Be stars in SMC open clusters

Published online by Cambridge University Press:  01 July 2008

Christophe Martayan ,
Dietrich Baade  and
Juan Fabregat
Christophe Martayan
Affiliation:
Royal Observatory of Belgium, 3 avenue circulaire 1180 Brussels, Belgium email: martayan@oma.be GEPI, Observatoire de Paris, CNRS, Université Paris Diderot; 5 place Jules Janssen 92195 Meudon Cedex, France
Dietrich Baade
Affiliation:
ESO – European Organisation for Astronomical Research in the Southern Hemisphere, Karl-Schwarzschild-Str. 2, D-85748 Garching b. Muenchen, Germany email: dbaade@eso.org
Juan Fabregat
Affiliation:
Observatorio Astronómico de Valencia, edifici Instituts d'investigació, Poligon la Coma, 46980 Paterna Valencia, Spain, email: Juan.Fabregat@uv.es
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Abstract

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At low metallicity, B-type stars show lower loss of mass and, therefore, angular momentum so that it is expected that there are more Be stars in the Magellanic Clouds than in the Milky Way. However, till now, searches for Be stars were only performed in a very small number of open clusters in the Magellanic Clouds. Using the ESO/WFI in its slitless spectroscopic mode, we performed a Hα survey of the Large and Small Magellanic Cloud. Eight million low-resolution spectra centered on Hα were obtained. For their automatic analysis, we developed the ALBUM code. Here, we present the observations, the method to exploit the data and first results for 84 open clusters in the SMC. In particular, cross-correlating our catalogs with OGLE positional and photometric data, we classified more than 4000 stars and were able to find the B and Be stars in them. We show the evolution of the rates of Be stars as functions of area density, metallicity, spectral type, and age.

Keywords

techniques: spectroscopicsurveysstars: emission-lineBegalaxies: individual (SMC)Magellanic Cloudsgalaxies: star clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S256: The Magellanic System: Stars, Gas, and Galaxies , July 2008 , pp. 349 - 354
Copyright
Copyright © International Astronomical Union 2009

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