Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973ap%26ss..22..381l&link_type=abstract
Astrophysics and Space Science, Volume 22, Issue 2, pp.381-392
Astronomy and Astrophysics
Astrophysics
77
Scientific paper
The common convective envelope model for W UMa systems is used to analyse the light curves of the sixteen systems with spectroscopic mass ratios. From the derived photometric elements, an indication is found that Binnendijk's W-type systems have only shollow common envelopes, which is therefore suggested to be the cause of the difference between A- and W-type systems. It is also suggested that the structure of many contact binaries permits only a shallow common envelope and that further study of such envelopes will yield the modification in the model required if a closer fit to the W-type light curves is to be obtained. The model is also used with mass ratio as an additional photometric element to analyse the light curve of AW UMa. The solution obtained confirms the remarkably small mass ratio of 0.08 found by Mauder and by Mochnacki and Doughty.
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