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New distance and depth estimates from observations of eclipsing binaries in the SMC

Published online by Cambridge University Press:  01 July 2008

Pierre L. North ,
Romain Gauderon  and
Frédéric Royer
Pierre L. North
Affiliation:
École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland email: pierre.north@epfl.ch
Romain Gauderon
Affiliation:
École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland email: pierre.north@epfl.ch
Frédéric Royer
Affiliation:
GEPI, Observatoire de Paris – Section de Meudon, 5, place Jules Jansen, F-92195 Meudon Cedex, France email: Frdric.Royer@obspm.fr
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Abstract

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A sample of 33 eclipsing binaries observed in a field of the SMC with FLAMES@VLT is presented. The radial velocity curves obtained, together with existing OGLE light curves, allowed the determination of all stellar and orbital parameters of these binary systems. The mean distance modulus of the observed part of the SMC is 19.05 mag, based on the 26 most reliable systems. Assuming an average error of 0.1 mag on the distance modulus to an individual system, and a gaussian distribution of the distance moduli, we obtain a 2-σ depth of 0.36 mag or 10.6 kpc. Some results on the kinematics of the binary stars and of the H ii gas are also given.

Keywords

binaries: eclipsingstars: distancesstars: evolutionstars: fundamental parametersstars: kinematicsgalaxies: distances and redshiftsgalaxies: kinematics and dynamicsgalaxies: individual (SMC)Magellanic Cloudsdistance scale
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S256: The Magellanic System: Stars, Gas, and Galaxies , July 2008 , pp. 57 - 62
Copyright
Copyright © International Astronomical Union 2009

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