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Astron. Astrophys. 327, 1087-1093 (1997)
On the relation of changes of the period and brightness
in the close binaries SW Cygni and U Sagittae
Vojt
ch 
imon
Astronomical Institute, Academy of Sciences,
251 65 Ond
ejov,
Czech Republic
Received 5 May 1997 / Accepted 11 July 1997
Abstract
The analysis of the available data allows to conclude that changes of the orbital periods in both Algol-type systems, SW Cyg and U Sge, are correlated with the brightness variations of the late-type loser. The episodes of decrease of the orbital period are accompanied by minimum of brightness of the loser in both cases.
Key words: binaries:
eclipsing 
stars:
late-type
stars: individual: SW Cyg, U Sge
Send offprint requests to: V. imon: simon@sunstel.asu.cas.cz
Contents
- 1. Introduction
- 2. Collection and analysis of the data
- 2.1. SW Cygni
- 2.2. U Sagittae
- 3. Discussion
- Acknowledgements
- References
© European Southern Observatory (ESO) 1997
Online publication: April 6, 1998
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