Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..599d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 599-607.
Astronomy and Astrophysics
Astronomy
6
Eclipsing Binary Stars, Periodic Variations, Stellar Orbits, Astronomical Photometry, Cepheus Constellation, Stellar Atmospheres
Scientific paper
A period study of the times of minima from 1900 to 1988, of a W UMa system GK Cep was performed. The system was found to have no significant secular period change, but the photoelectric observations reveal a short-term periodic oscillation of the photometric period with an amplitude of about 0.035 day around the mean value of P = 0.9361653 day. Such oscillation of the photometric period has been discussed in terms of (1) the magnetically induced deformations in the atmosphere, (2) mass motions in the core of a computer star, (3) cyclic behavior in the mass transfer or mass loss rate, and (4) the light time effect due to a third body in the system. It was shown that the hypothetical third body could be an FOV star, which is about 2.5 m fainter than GK Cep, and only 0.01 arcsec away from it. The magnetic activity may not be the responsible mechanism for the observed cyclic period variation, because the system consists of two early A spectral-type components probably with no convective envelopes.
Demircan Osman
Derman Ethem
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