Analysis of the MOST light curve of the heavily spotted K2IV component of the single-line spectroscopic binary II Pegasi

作者：Siwak Michal^*; Rucinski Slavek M; Matthews Jaymie M; Kuschnig Rainer; Guenther David B; Moffat Anthony F J; Sasselov Dimitar; Weiss Werner W

来源：Monthly Notices of the Royal Astronomical Society, 2010, 408(1): 314-321.

DOI：10.1111/j.1365-2966.2010.17109.x

• stars: flare
• stars: individual: II Peg
• stars: rotation
• starspots

Continuous photometric observations of the visible component of the single-line, K2IV spectroscopic binary II Peg carried out by the MOST satellite during 31 consecutive days in 2008 have been analysed. On top of spot-induced brightness modulation, 11 flares were detected of three distinct types characterized by different values of rise, decay and duration times. The flares showed a preference for occurrence at rotation phases when the most spotted hemisphere is directed to the observer, confirming previous similar reports. An attempt to detect a grazing primary minimum caused by the secondary component transiting in front of the visible star gave a negative result. The brightness variability caused by spots has been interpreted within a cold spot model. An assumption of differential rotation of the primary component gave a better fit to the light curve than a solid-body rotation model.

• 出版日期2010-10-11