| Issue |
A&A
Volume 369, Number 3, April III 2001
|
|
|---|---|---|
| Page(s) | 960 - 964 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20010178 | |
| Published online | 15 April 2001 | |
A Photometric study of the near-contact system RU Ursae Minoris*
Department of Astrophysics, Astronomy and Mechanics, Faculty of Physics, University of Athens, 157 84 Zographou, Athens, Greece
Corresponding author: P. G. Niarchos, pniarcho@cc.uoa.gr
Received:
7
December
2000
Accepted:
23
January
2001
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
© ESO, 2001
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