Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...356..643o&link_type=abstract
Astronomy and Astrophysics, v.356, p.643-653 (2000)
Astronomy and Astrophysics
Astrophysics
54
Stars: Activity, Stars: Binaries: Close, Stars: Late-Type, Stars: Rotation, Stars: Starspots, Techniques: Photometric
Scientific paper
We studied the long-term light behaviour of ten rapidly-rotating active stars (LQ Hya, V833 Tau, EI Eri, V711 Tau, BY Dra, HU Vir, IL Hya, VY Ari, HK Lac, IM Peg) with Fourier analysis. Using photometric databases of up to 30 years in length, we search for periodic or quasi-periodic long-term variations of the overall light levels. Out of the ten stars studied, nine show cyclic variability and six of those seem to vary on two or multiple time-scales. Using additional data from the literature, we found that cycle lengths were generally longer for stars with longer rotation periods. The inverse Rossby numbers of these stars show a correlation with omega cyc/Omega (= Prot/Pcyc) calculated from the shortest cycle length. The cycle lengths of several stars agree well with other types of cycles determined earlier. Using artificial test data, we found that the cyclic variation of the average light level is determined by the change in the spot/plage coverage alone and that spot migration does not play a significant role in the shape or length of the long-term brightness changes.
Kolláth Zoltan
Oláh Katalin
Strassmeier Klaus G.
No associations
LandOfFree
Multiperiodic light variations of active stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Multiperiodic light variations of active stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiperiodic light variations of active stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-747855