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Astron. Astrophys. 335, 545-548 (1998)


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Research Note

An analysis of the photometric variation of the symbiotic star AG Draconis in quiescence

M. Friedjung 1, L. Hric 2, K. Petrík 3 and R. Gális 2

1 Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France (friedjung@iap.fr)
2 Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatranská Lomnica, The Slovak Republic (hric@ta3.sk)
3 Department of Mathematics, Informatics and Physics, Pedagogical Faculty, University of Trnava, 918 43 Trnava, The Slovak Republic

Received 30 January 1998 / Accepted 14 April 1998

Abstract

The photometric variations of the symbiotic binary AG Dra have been analyzed. Changes in the U band variations in quiescence between orbital cycles are most easily explained by changes in the cool component wind. The small variations of B and V in quiescence seem to require an additional mechanism. Period analysis of the data from the quiescent stage between two outbursts (1986 - 1994) gave a value for the period in the U band near the orbital period. However new periods were detected with the values of 356 and 350 days in the B and V bands respectively, which is strikingly close to the interval between the two large maxima in B and V, seen during activity.

Key words: stars: novae, cataclysmic variables – stars: binaries: symbiotic – stars: individual: AG Dra

Send offprint requests to: M. Friedjung

© European Southern Observatory (ESO) 1998

Online publication: June 18, 1998

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