Spot activity of II Peg
作者： Thomas Hackman , MJ Mantere , Lauri Jetsu , Ilya Ilyin , P Kajatkari
关键词: Physics 、 Light curve 、 Starspot 、 PEG ratio 、 Astrophysics 、 Dynamo theory 、 Doppler imaging 、 Photometry (optics) 、 Spectroscopy
摘要: We have studied the long-term spot activity of RS CVn star II Peg by means Doppler imaging based on spectroscopy and time series analysis photometry. present 28 temperature maps spanning years 1994–2010, which 14 were calculated for study. The longitudinal distribution, derived from surface maps, is compared with epochs light curve minima, photometric observations. detect a drift in major structure during 1995–2003. After this there clear decrease level no can be seen. conclude that variations could caused cyclic behaviour underlying magnetic dynamo (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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