W Ursae Majoris Stars: Period-Spectral Type Relation and Period Changes

Details W Ursae Majoris Stars: Period-Spectral Type Relation and Period Changes W Ursae Majoris Stars: Period-Spectral Type Relation and Period Changes

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..34..413y&link_type=abstract

Astrophysics and Space Science, Volume 34, Issue 2, pp.413-424

Astronomy and Astrophysics

Astrophysics

16

Scientific paper

The relation between period and spectral type is examined for 33 W Ursae Majoris stars for which accurate observations have enabled us to clearly classify their eclipse types at the primary minimum (transit (A) or occultation (W)). About a half of the examined stars are of A-type, and the rest correspond to W-type. Periods of W-type systems are found to fall within 0.25 0.5 days, while periods of A-type systems range between 0.25 0.9 days. For A-type systems certain period-spectral type relations seem to hold, but for W-type systems no definite relation could be found. Statistically, a W Ursae Majoris star will undergo a period change every ˜17000 cycles, on the average, and a time scale for the period change (d lnP/dt)-1 is estimated to be about 106 years.

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