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

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

2008-09-16

arxiv.org/abs/0809.2728v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, Proc. IAU Symp. No 256, The Magellanic System: Stars, Gas and Galaxies, eds. Jacco Th. van Loon & Joana M.

Scientific paper

10.1017/S1743921308028263

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, 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-sigma 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.

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