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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