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Astron. Astrophys. 327, 1087-1093 (1997)

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On the relation of changes of the period and brightness
in the close binaries SW Cygni and U Sagittae

Vojtch imon

Astronomical Institute, Academy of Sciences, 251 65 Ondejov, Czech Republic

Received 5 May 1997 / Accepted 11 July 1997


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

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© European Southern Observatory (ESO) 1997

Online publication: April 6, 1998