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          Institute: MPI für Astrophysik     Collection: Stellar Astrophysics     Display Documents

ID: 10757.0, MPI für Astrophysik / Stellar Astrophysics
An empirical method to estimate the LMC distance using B-stars in eclipsing binary systems
Authors:Salaris, M.; Groenewegen, M. A. T.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:2
Start Page:440
End Page:445
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a new method to determine the distance to B-stars in eclipsing binary systems. The method is completely empirical and it is based on the existence of a very tight linear relationship between the V-band "zero, magnitude angular diameter" and the Stromgren colour index cl for B-stars; we have empirically calibrated this relationship using local single B-stars with accurate angular diameters, and B-stars in eclipsing binaries with precise radii and parallax determinations. By studying the differential behaviour of this relationship as predicted by theoretical stellar evolution models, we find that it is independent of the stellar metallicities for a range of [Fe/H] values between the solar one and that of Young stars in the Magellanic Clouds. The method, which also provides the value of the reddening to the system, is discussed ill detail, together with a thorough estimate of the associated errors. We conclude that accurate Stromgren photometry obtainable with 1.5 m-class telescopes of the LMC eclipsing binaries HV 2274 and HV 982 will allow to obtain an empirical LMC distance with an accuracy of the order of 0.13 mag.
Free Keywords:binaries : eclipsing; stars : distances; stars : individual : HD 24909; HD 161783; HD 218066; HV 982; HV 2274; stars : fundamental parameters; Magellanic Clouds; distance scale
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
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