Spots and activity cycles of the star FKCom---2013-2015 data analysisстатья
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Дата последнего поиска статьи во внешних источниках: 20 июня 2016 г.
Аннотация:Abstract
We present an analysis of new photometric and spectropolarimetric observations
of a chromospherically active star FKCom. Based on this observational data and
the data from the literature sources, applying a common technique, we
performed an analysis of a complete set of the available photometric data,
which were divided into 218 individual light curves. For each of them a
reverse problem of restoring largescale temperature irregularities on the
surface of the star from its light curve was solved. We analyzed the time
series for the brightness of the star in the U-, B-, and V-bands, the
brightness variability amplitudes, the total area of the spots on the surface
of the star, and the average brightness of each set considered. The analysis
of determination results of the positions of active longitudes leads to the
conclusion about the existence of two systems of active regions on the FKCom
surface. It was determined that the positions of each of these systems undergo
cyclic changes. This confirms the conclusion on the likely absence of a
strongly pronounced regularity of the flip-flops in FKCom, earlier suggested
by other researchers. The results of the new polarimetric observations FKCom
in 2014-2015 are presented. These measurements evidence the legitimacy of the
proposed interpretation the behavior of the longitudinal magnetic field
strength < B z >, indicating the settling-in of a more symmetric distribution
of magnetic region on the FKCom surface. An increasing activity of the star
over the recent years, registered from the photometric observations is also
consistent with the probable onset of growth in the < B z > parameter
starting from 2014.