Changing stellar activity cycles

Details Changing stellar activity cycles Changing stellar activity cycles

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007an....328.1072o&link_type=abstract

Astronomische Nachrichten, Vol.328, Issue 10, p.1072

Astronomy and Astrophysics

Astronomy

5

Stars: Activity, Stars: Atmospheres, Stars: Late-Type, Stars: Magnetic Fields, Starspots

Scientific paper

We investigated continuous long-term photometric datasets of thirteen active stars, Ca II variability of one single main-sequence star, and 10.7cm radio data of the Sun, with simple Fourier- and time-frequency analysis. The data reflect the strength of the activity manifested in magnetic spots. All studied stars show multiple (2 to 4) cycles of different lengths. The time-frequency analysis reveals, that in several cases of the sample one or two of the cycles exhibit continuous changes (increase or decrease). For four stars (V711 Tau, IL Hya, HK Lac, HD 100180) and for the Sun we find that the cycle length changes are strong, amounting to 10-50% during the observed time intervals. The cycle lengths are generally longer for stars with longer rotational periods.

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