Distance scale calibration based on early-type binaries
1 Centrum Astronomiczne im. Miko³aja Kopernika (CAMK), PAN, Bartycka 18, 00-716 Warsaw, Poland
2 Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101-1292, USA
Published online: 8 September 2017
Our main goal is to establish a firm empirical calibration of the surface brightness vs. (V-K) color relation for early type stars based on high quality spectroscopic and infrared observations of early-type detached eclipsing systems in the Large Magellanic Cloud (LMC). Our calibration of this relation will allow distance determinations accurate to about 2.5% to a single object located well beyond the Magellanic Clouds. This will let us calibrate other distance indicators, including period-luminosity relations for Cepheids. The first step of the project is to determine precise parameters for a sample of B-type systems in the LMC. We have already made a preliminary analysis of light and radial velocity curves for selected objects and measured their masses and radii. Here we present the results for one such system.
© The Authors, published by EDP Sciences, 2017
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