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Period Changes of Dwarf Cepheids, I. CY Aquarii, EH Librae, DY Pegasi
The period changes of the dwarf cepheids CY Aqr, EH Lib and DY Peg arediscussed and O-C diagrams of these stars are constructed. EH Librae hasa slightly stable, constant period. The period of CY Aquarii changedsuddenly in 1952 (deltaP = -1.81 x 10E-7 day = 0.016 sec). Before theabrupt change its period showed small fluctuations, such fluctuationshave also been shown since that time. The period of DY Pegasi has becomeshorter during the past 45 years. At present no distinction can be madebetween the continuous change (at the rate Beta = -7.6 x 10E-13 dayscycleE-1 = -0.03 sec centuryE-1) or the abrupt change of period (deltaP= -6.5 x 10E-8 day) in 1961.
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