Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...467..229p&link_type=abstract
Astronomy and Astrophysics, Volume 467, Issue 1, May III 2007, pp.229-235
Astronomy and Astrophysics
Astrophysics
3
Stars: Activity, Stars: Individual: Fk Comae Berenices, Stars: Individual: Hd 199178, Stars: Starspots
Scientific paper
Aims:The rapidly rotating active stars FK Com and HD 199178 are investigated using extensive long-term photometry. The data set includes previously unpublished photometry, obtained at the Rozhen National Astronomical Observatory. We look for periodicities in the long-term photometric behaviour of both stars, as well as for spots, using light curve modelling. Special attention is paid to the behaviour of the "flip-flop" phenomenon. Methods: Light curves in UBV of FK Com and HD 199178 are used to construct an O-C diagram for each star, and they are modelled to obtain spot distribution. Results: The main result for FK Com is that the "flip-flop" phenomenon is a superposition of an oscillating process of activity and real and fast "flip-flops". For the oscillating component, we obtained a cycle of 5.8 years. The same cycle is also present in other photometric characteristics. The O-C diagram for HD 199178 shows a cycle of 4.2 years. Modelling of the light curves of both stars reveals a large high-latitude spot on each star and also smaller spots in the equatorial belt or at intermediate latitudes.
Tables 2, 3, and 5 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/467/229
Dimitrov Darko
Panov K.
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