South African Journal of Science
On-line version ISSN 1996-7489
Print version ISSN 0038-2353
W Ursae Majoris (W UMa)-type variable stars are over-contact eclipsing binary stars. To understand how these systems form and evolve requires observations spanning many years, followed by detailed models of as many of them as possible. The All Sky Automated Survey (ASAS) has an extensive database of these stars. Using the ASAS V band photometric data, models of W UMa-type stars are being created to determine the parameters of these stars. This paper discusses the classification of eclipsing binary stars, the methods used to model them as well as the results of the modelling of ASAS 120036-3915.6, an over-contact eclipsing binary star that appears to be changing its period.
Keywords : binaries; eclipsing; binaries; close; stars; individual; ASAS120036-3915.6.