Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.287..567c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 287, Issue 3, pp. 567-574.
Astronomy and Astrophysics
Astronomy
17
Stars: Activity, Binaries: Eclipsing, Stars: Imaging, Stars: Individual: Xy Uma, Stars: Late-Type, Stars: Magnetic Fields
Scientific paper
We present and analyse V-band light curves of the detached eclipsing binary system XY UMa, obtained in 1992 October, 1995 March and November, and 1996 February. 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 search for evidence that cool starspots are the agents responsible for the variability of the light curve. We derive a new set of geometric system parameters, which we find to be very similar to those derived by Hilditch & Bell. The image derived from the 1992 light curve shows an amorphous band of unresolved spots with a low filling factor, extending over much of the inward-facing hemisphere of the primary. This result is consistent with the extent of the dark-zone model proposed by Hilditch & Bell in their earlier analysis of this same light curve. Irregularities in the primary eclipse profile observed in 1995 and early 1996 are consistent with the eclipse of a dark spot or spots on the inner face of the primary. The major spot in this region appears to be resolved on our 9 deg surface grid, indicating that the spot consists of an unbroken umbral region some 15 deg in radius.
Collier Cameron Andrew
Hilditch Ron W.
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