COMMUNICATIONS / MITTEILUNGEN

Hamid A. Mahdy and B. Szeidl

Period Changes of Dwarf Cepheids, I. CY Aquarii, EH Librae, DY Pegasi

No. 74
Budapest, 1980

Abstract

The period changes of the dwarf cepheids CY Aqr, EH Lib and DY Peg are discussed and O-C diagrams of these stars are constructed. EH Librae has a slightly stable, constant period. The period of CY Aquarii changed suddenly in 1952 (deltaP = -1.81 x 10^-7 day = 0.016 sec). Before the abrupt change its period showed small fluctuations, such fluctuations have also been shown since that time. The period of DY Pegasi has become shorter during the past 45 years. At present no distinction can be made between the continuous change (at the rate Beta = -7.6 x 10^-13 days cycle^-1 = -0.03 sec century^-1) or the abrupt change of period (deltaP = -6.5 x 10^-8 day) in 1961.

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