Spot activity of II Peg
2011 (English)In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 332, no 9-10, 859-865 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2011. Vol. 332, no 9-10, 859-865 p.
binaries: spectroscopic, stars: activity, stars: individual (II Peg), starspots, techniques: spectroscopic
IdentifiersURN: urn:nbn:se:uu:diva-166729DOI: 10.1002/asna.201111616ISI: 000297949100002OAI: oai:DiVA.org:uu-166729DiVA: diva2:477588