Active Longitudes and Magnetic Cycles on AB Dor

Details Active Longitudes and Magnetic Cycles on AB Dor Active Longitudes and Magnetic Cycles on AB Dor

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..848b&link_type=abstract

Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held

Astronomy and Astrophysics

Astronomy

Scientific paper

We analyze photometric observations of the young active dwarf AB Dor spanning almost 20 years. Similar to the young solar analogue LQ Hya and the Sun AB Dor shows long-lived non-axisymmetric spot distribution - active longitudes in opposite hemispheres. We find indications of two activity cycles. One cycle originates from repeating switches of the activity between the two active longitudes in about (2.5-3.5)-year intervals. This results in the ""flip-flop"" cycle of 5-7 years which includes two consecutive switches. The second cycle is seen in mean brightness variations of the star on the time-scale 19-22 years and is accompanied by migration of the active longitudes due to differential rotation.

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