Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011an....332..859h&link_type=abstract
Astronomische Nachrichten, Vol.332, Issue 9/10, p.859
Astronomy and Astrophysics
Astronomy
Binaries: Spectroscopic, Stars: Activity, Stars: Imaging, Stars: Individual (Ii Peg), Starspots, Techniques: Spectroscopic
Scientific paper
We have studied the long-term spot activity of the RS CVn star II Peg by means of Doppler imaging based on spectroscopy and time series analysis of photometry. We present 28 Doppler imaging temperature maps spanning the years 1994-2010, of which 14 were calculated for the present study. The longitudinal spot distribution, derived from the surface temperature maps, is compared with epochs of the light curve minima, derived from photometric observations. We detect a longitudinal drift in the major spot structure during 1995-2003. After this there is a clear decrease in the activity level and no clear drift can be seen. We conclude that the variations could be caused by a cyclic behaviour of the underlying magnetic dynamo.
Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.
Hackman Thomas
Ilyin I. I.
Jetsu Lauri
Kajatkari P.
Kochukhov Oleg
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