Photometric evidence for widespread spot activity on the primary component of the short-period RS CVn binary XY UMa

Details Photometric evidence for widespread spot activity on the primary component of the short-period RS CVn binary XY UMa Photometric evidence for widespread spot activity on the primary component of the short-period RS CVn binary XY UMa

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277..747h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 277, NO. 2/NOV15, P. 747, 1995

Astronomy and Astrophysics

Astronomy

10

Stars: Activity - Binaries: Eclipsing - Stars: Coronae - Stars: Imaging - Stars: Late-Type - Stars: Magnetic Fields

Scientific paper

A survey of published light curves, obtained since 1975, of the eclipsing RS CVn-type binary star XY UMa, coupled with results from a recent high-precision light curve, provides substantial evidence for the existence of a polar spot on the G2V primary component. The well-known and strong variability of the shape of the light curve has been explained by the presence of surface maculation, often at low latitudes, which varies on time-scales of ˜1 month, and which may persist for longer intervals. The 20-year span of published light curves, however, shows that the entire system brightness varies by as much as 0.5 mag in the V band. No orbital phase is exempt from this longer-term variation, suggesting that the portion of the dominant primary component that is always visible - namely the polar region - is at least partly responsible for the long-term variation in system brightness.
It is proposed that the surface of the primary component of XY UMa is very like that seen in the rapidly rotating single G dwarf star AB Dor, and the RS CVn binary DM UMa, namely, dominated by a polar spot but with a second belt of spot activity at lower latitudes.

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