Journal Article

A photometric study of the contact binaries V523 Cas and TY UMa

T. A. Lister, R. M. McDermid and R. W. Hilditch

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 317, issue 1, pages 111-119
Published in print September 2000 | ISSN: 0035-8711
Published online September 2000 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1046/j.1365-8711.2000.03552.x
A photometric study of the contact binaries V523 Cas and TY UMa

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Broad-band V and I photometry of the short-period W UMa-type contact binaries V523 Cas and TY UMa are reported. From the light curves, the system parameters have been determined and evidence is presented for extensive spot activity in both systems, with V523 Cas being the more active system. A compilation of all the available photoelectric and CCD-based timings of eclipse minima is made; the O−C diagrams show evidence for an increasing period in the case of V523 Cas and a decreasing period in TY UMa. In addition we derive a more accurate astrometric position for V523 Cas from our CCD images.

Keywords: stars: activity; stars: atmospheres; binaries: eclipsing; stars: fundamental parameters; stars: late-type

Journal Article.  2924 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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