Starspot distributions on XY UMa during 1997-2000 from eclipse mapping

Details Starspot distributions on XY UMa during 1997-2000 from eclipse mapping Starspot distributions on XY UMa during 1997-2000 from eclipse mapping

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.326.1489l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 326, Issue 4, pp. 1489-1498.

Astronomy and Astrophysics

Astronomy

4

Stars: Activity, Binaries: Eclipsing, Stars: Imaging, Stars: Individual: Xy Uma, Stars: Late-Type, Stars: Magnetic Fields

Scientific paper

We present narrow-band red light curves and surface maps of the short-period RS CVn binary system XY UMa, obtained between 1997 January and 2000 March. The light-curve morphology of this system is known to vary on time-scales of a few days. We have used eclipse-mapping techniques to map the distribution of cool starspots on the surface of the primary star. The resulting maps show the continued evolution of spot features on time-scales of a few days to a week. By comparison with the images of Collier Cameron & Hilditch, we also find evidence for longer term trends, including a decline to an activity minimum during 1997 and a rise in activity during 1998-2000. We also find marginal evidence from the O-C ephemeris curves for a periodicity and a peak corresponding to the time of activity minimum.

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