Issue |
A&A
Volume 440, Number 3, September IV 2005
|
|
---|---|---|
Page(s) | 1161 - 1165 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361:20053562 | |
Published online | 05 September 2005 |
Photometric observations from theoretical flip-flop models
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14882 Potsdam, Germany e-mail: [hkorhonen;delstner]@aip.de
Received:
3
June
2005
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
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