A Photometric study of the near-contact system RU Ursae Minoris

Free access article

Issue		A&A Volume 369, Number 3, April III 2001


Page(s)		960 - 964
Section		Formation, structure and evolution of stars
DOI		http://dx.doi.org/10.1051/0004-6361:20010178

A&A 369, 960-964 (2001)
DOI: 10.1051/0004-6361:20010178

A Photometric study of the near-contact system RU Ursae Minoris

V. N. Manimanis and P. G. Niarchos

Department of Astrophysics, Astronomy and Mechanics, Faculty of Physics, University of Athens, 157 84 Zographou, Athens, Greece

(Received 7 December 2000 / Accepted 23 January 2001)

Abstract
The near-contact system RU UMi with an F0 primary and a K5 secondary was observed in U, B and V wavelengths in May and July 1998, as well as in March, May and July 1999. Six new observed times of minima are given and a new ephemeris is proposed. The basic parameters of the system extracted by our observations were used for spot modelling of the light curves. A simple spot distribution was determined, based on a model with one relatively small cool spot on the surface of the secondary. Absolute elements were calculated and the evolutionary status was determined. Our data favor a semi-detached configuration, with the secondary filling its inner Roche lobe; the primary must also be near the limits of its lobe.

Key words: stars: binaries: eclipsing, starspots, stars: individual: RU UMi

Offprint request: P. G. Niarchos, pniarcho@cc.uoa.gr

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