Issue |
A&A
Volume 420, Number 3, June IV 2004
|
|
---|---|---|
Page(s) | 1039 - 1045 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20040126 | |
Published online | 04 June 2004 |
Modeling the changing spot features of SW Lacertae: A three year study*
1
Ankara University, Faculty of Science, Dept. of Astronomy and Space Sciences, 06100 Tandoğan, Ankara, Turkey
2
Astronomical Observatory, Volgina 7, 11160 Belgrade, Serbia and Montenegro and Isaac Newton Institute of Chile, Yugoslav branch, Yugoslavia
Corresponding author: B. Albayrak, albayrak@astro1.science.ankara.edu.tr
Received:
1
April
2003
Accepted:
18
March
2004
In the present study, the activity of the eclipsing binary of the W UMa-type
system SW Lac is examined by analysing the new BV photoelectric
observations obtained in 2001, 2002 and 2003 at the Ankara University
Observatory. During this period, the seasonal light curves show significant
differences and asymmetries. A simultaneous analysis of the light curves is
made using Djurašević's inverse-problem method. To explain the light-curve
asymmetries and the different maximum light levels in the seasonal light curves
we used a Roche model that involved regions containing spots on the components.
The analysis shows that SW Lac is in an overcontact configuration with a
relatively high degree of overcontact 31%. The Roche model
with spotted areas on the more massive and cooler component yields a good fit
of the observations for the whole set of the seasonal light curves, without any
changes of the basic system parameters. This indicates that the complex nature
of the light-curve variations during the examined period
can be explained by the changes of spotted areas on the cooler component,
which cover a significant part of the stellar surface.
Key words: stars: binaries: eclipsing / stars: binaries: close / stars: individual: SW Lac
© ESO, 2004
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