Journal Article

Two extreme contact binary systems in the nearest globular cluster M4

L. Liu, S.-B. Qian and E. Fernández-Lajús

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 2, pages 1509-1522
Published in print August 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18791.x
Two extreme contact binary systems in the nearest globular cluster M4

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We present the results of photometric solutions for two contact binaries in the nearby globular cluster M4. We estimate their physical parameters using the light-curve program of the Wilson–Devinney code. These systems have quite different mass ratios, which indicates that they did not form at the same time. V47 is an extreme mass-ratio system (q= 0.123 ± 0.002) being dissimilar to the same kind of field contact binaries. V53 is a high mass-ratio (q= 1.230 ± 0.004), deep-contact (f= 79.7 ± 1.9 per cent) system. It is also a blue straggler.

Keywords: binaries: eclipsing; blue stragglers; stars: evolution; stars: individual: V47; stars: individual: V53

Journal Article.  3589 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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