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Eclipsing binary distances to the edge of the Local Group

Published online by Cambridge University Press:  26 February 2013

Alceste Z. Bonanos
Alceste Z. Bonanos*
Affiliation:
Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Metaxa & Pavlou, Palaia Penteli 15236, Greece email: bonanos@astro.noa.gr
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Abstract

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Eclipsing binaries are powerful tools for determining the fundamental parameters of stars and, therefore, for measuring accurate, independent distances to nearby galaxies. I present distance measurements that are in progress based on early-type eclipsing binary systems in several Local Group galaxies at a range of metallicities, and discuss the strengths of the method, the limitations and possible sources of systematic error. The goal is to establish several local stepping stones along the extragalactic distance ladder, which will help calibrate the Cepheid period–luminosity relation and thus resolve the ongoing controversy about the distance scale, with its ramifications for cosmology and stellar ages.

Keywords

distance scalestars: distancesbinaries: eclipsingstars: fundamental parametersLocal Group
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 173 - 178
Copyright
Copyright © International Astronomical Union 2013

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