Evolutionary Changes in the Periods of Cepheids
Л. Н. БердниковV. V. IgnatovaTashkent University and Astronomical Institute, 33 Astronomicheskaya st., Tashkent 700052, Uzbekistan
ABI
Аннотация
Abstract Our analysis of O – C diagrams for 230 (mainly northern) Cepheids revealed that periods of 67 of them show evolutionary changes. New parabolic elements for these Cepheids are presented.
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