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Issue A&A
Volume 373, Number 3, July III 2001
Page(s) 950 - 959
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010681



A&A 373, 950-959 (2001)
DOI: 10.1051/0004-6361:20010681

KW Persei -a near-contact system?

R. Gális1, L. Hric2 and P. Niarchos3

1  Faculty of Sciences, University of P. J. Safárik, Moyzesova 16, 041 54 Kosice The Slovak Republic
2  Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatranská Lomnica, The Slovak Republic
    e-mail: hric@ta3.sk
3  Department of Astrophysics, Astronomy and Mechanics, Faculty of Physics, University of Athens, Panepistimiopolis, 15784 Zografos, Athens, Greece
    e-mail: pniarcho@cc.uoa.gr

(Received 11 December 2000/ Accepted 12 April 2001)

Abstract
An analysis of UBV photoelectric photometry for the eclipsing binary KW Per based on new observational data is presented. The light changes are not only due to eclipses, but also to activity in the system. The U, B and V light curves are analyzed by the Binary Maker 2.0 and Wilson-Devinney codes to derive the geometrical and physical parameters of the system. Since the O'Connell effect is present on the light curves in the three colours, the unperturbed parts of the light curves are considered to represent the quiet stage of the system, in contrast to the active stage which is represented by the perturbed parts of the light curves. The discussion about the evolutionary status of the system indicates that the secondary component of the binary system is an evolved star and the primary is a MS star.


Key words: binaries: eclipsing -- techniques: photometric -- stars: individual: KW Per

Offprint request: R. Gális, galis@kosice.upjs.sk

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