Photometric observations from theoretical flip-flop models
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14882 Potsdam, Germany e-mail: [hkorhonen;delstner]@aip.de
Accepted: 9 June 2005
Some active stars show a so-called flip-flop phenomenon in which the main spot activity periodically switches between two active longitudes that are 180° apart. In this paper we study the flip-flop phenomenon by converting results from dynamo calculations into long-term synthetic photometric observations, which are then compared to the real stellar observations. We show that similar activity patterns as obtained from flip-flop dynamo calculations, can also be seen in the observations. The long-term light-curve behaviour seen in the synthesised data can be used for finding new stars exhibiting the flip-flop phenomenon.
Key words: magnetic fields / magnetohydrodynamics (MHD) / stars: late-type / starspots
© ESO, 2005