Starspot activity on the RS CVn-type binary II Pegasi during 1999-2001

Details Starspot activity on the RS CVn-type binary II Pegasi during 1999-2001 Starspot activity on the RS CVn-type binary II Pegasi during 1999-2001

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...405..763g&link_type=abstract

Astronomy and Astrophysics, v.405, p.763-768 (2003)

Astronomy and Astrophysics

Astrophysics

5

Stars: Late-Type, Stars: Activity, Stars: Imaging, Stars: Starspots, Stars: Individual: Ii Peg

Scientific paper

By means of Doppler imaging, new high-resolution spectroscopic observations of II Peg, carried out in three observing seasons from 1999 to 2001, were analyzed. The lines FeI6430.844 Å and CaI6439.075 Å were chosen as map lines, and three surface maps of II Peg were obtained. The results demonstrate that the main features of these surface maps are high-latitude active regions around 60° and no polar cap is seen in the maps. The surface patterns of II Peg show large changes, the largest scale active regions appear in July-Aug. 1999 and then they become small and separated in Feb. 2000. The active longitude switches to another hemisphere in Nov.-Dec. 2001 from the one in Feb. 2000. Such spot evolution is not consistent with the activity cycle derived previously.

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