Free access article

A&A 440, 1161-1165 (2005)
DOI: 10.1051/0004-6361:20053562

Photometric observations from theoretical flip-flop models

H. Korhonen and D. Elstner

Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14882 Potsdam, Germany
    e-mail: [hkorhonen;delstner]@aip.de

(Received 3 June 2005 / Accepted 9 June 2005)

Abstract
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

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