Astron. Astrophys. Suppl. Ser. 135, 29-40

New periods of variable stars in Cygnus based on a quarter of century of photographic observations

L. Hric ¹ and R. Gális ¹

Send offprint request: L. Hric

1 - Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatranská Lomnica, The Slovak Republic
e-mail: hric@ta3.sk galis@ta3.sk

Received March 13; accepted September 22, 1998

Abstract:

This work summarizes the results of photographic photometry obtained over 24 years at the Skalnaté Pleso (1979-1993) and Asiago (1969-1988) observatories. The period of light changes, the epoch of the maximum or of the minimum, the type of variability and, in some cases, possible causes of the long-term behaviour of light changes were determined for 17 variable stars.

Key words: stars: techniques: photometric -- stars: variables: general