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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
Affiliation:
École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland email: [email protected]
Romain Gauderon
Affiliation:
École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland email: [email protected]
Frédéric Royer
Affiliation:
GEPI, Observatoire de Paris – Section de Meudon, 5, place Jules Jansen, F-92195 Meudon Cedex, France email: [email protected]
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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

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