Статья

Study of FK Comae Berenices

H. KorhonenAstronomy Division, PO Box 3000, 90014 University of Oulu, FinlandS. V. BerdyuginaAstronomy Division, PO Box 3000, 90014 University of Oulu, FinlandI. TuominenAstronomy Division, PO Box 3000, 90014 University of Oulu, FinlandM. I. AndersenAstronomy Division, PO Box 3000, 90014 University of Oulu, FinlandJ. PiironenObservatory, PO Box 14, 00014 University of Helsinki, FinlandK. G. StrassmeierAstrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, GermanyK. N. GrankinAstronomical Institute of the Academy of Sciences of Uzbekistan, Astronomicheskaya 33, Tashkent 700052, UzbekistanSanna KaasalainenObservatory, PO Box 14, 00014 University of Helsinki, FinlandHannu KarttunenTuorla Observatory, University of Turku, Väisäläntie 20, 21500 Piikkiö, FinlandS. MelnikovAstronomical Institute of the Academy of Sciences of Uzbekistan, Astronomicheskaya 33, Tashkent 700052, UzbekistanВ. С. ШевченкоAstronomical Institute of the Academy of Sciences of Uzbekistan, Astronomicheskaya 33, Tashkent 700052, UzbekistanM. TrisoglioDipartemento di Fisica, Universita degli Studi di Padova, Via 8 Febbraio, 2, 35122 Padova, ItalyJenni VirtanenObservatory, PO Box 14, 00014 University of Helsinki, Finland

Astronomy and Astrophysicsjournal2001en

ABI

Аннотация

We present 8 years of previously unpublished photometric observations of FK Com together with the determination of the stability of the primary comparison star HD 117567. The observations have been carried out between 1993 and 2001 at four different observatories and they consist of 5157 data points in total: U(903), B(994), V(1643), R(166), Ic(573), b(461) and y(417). We also analyse this new data together with the previously published photometric observations. The V magnitude shows variations with dominant periods of about 3, 6, 12, 14 and 31 years. The short-term light curve variations appear to be caused by rearrangement of approximately constant amount of cool spots. From the values for different colours obtained during the brightest season observed, corresponding to the supposedly unspotted surface, the spectral type of FK Com is determined to be G7 III.

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Темы

Stellar, planetary, and galactic studies Astronomical Observations and Instrumentation Astronomy and Astrophysical Research

Идентификаторы

DOI: 10.1051/0004-6361:20010804

Цитирования и источники

Цитирований: 0Использованных источников: 9

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