A Study of Differential Rotation on II Pegasi Using Starspot Imaging

Details A Study of Differential Rotation on II Pegasi Using Starspot Imaging A Study of Differential Rotation on II Pegasi Using Starspot Imaging

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343407r&link_type=abstract

American Astronomical Society, AAS Meeting #213, #434.07; Bulletin of the American Astronomical Society, Vol. 41, p.304

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Scientific paper

II Pegasi is an RS CVn binary consisting of a main-sequence star and a K2 subgiant which are tidally locked and orbit one another with a 6.724333-day period. The subgiant is known to exhibit exceptionally large dark starspots on its surface. In this study B- and V- filter light curves obtained from 1987-2007 via the Vanderbilt/Tennessee State 0.4-m Automated Photometric Telescope on Mount Hopkins, AZ were inverted to produce images of the starspots to look for evidence of latitude-dependent differential rotation on the spotted star's surface. The surface maps presented here provide convincing evidence that the star's equatorial regions rotate with a shorter period than do higher latitudes, as is observed on the Sun.
We acknowledge the support of Ohio Wesleyan and Lehigh Universities.

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