Period changes in EI Cephei

Details Period changes in EI Cephei Period changes in EI Cephei

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.135..229s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 135, no. 2, July 1987, p. 229-235.

Astronomy and Astrophysics

Astrophysics

2

Eclipsing Binary Stars, Light Curve, Periodic Variations, Cepheid Variables, Electrophotometry, Stellar Spectra

Scientific paper

A new period (P = 8d.439422) of the eclipsing system EI Cephei has been given, which is based on all available times of minima. Periods using Strohmeier's (1958) epoch have also been presented for the observations given by other investigators. A period based on only photoelectric minima comes out to be 8d.439336, which is lesser than the earlier periods given in the literature. O-C diagrams of EI Cephei have been presented for the first time, and period variations have been estimated in different portions of the O-C diagram of EI Cephei. Strong period changes have occurred around the years 1959 and 1965. The total change in period (ΔP/P) ranges from 6.7×10-5 to 4.3×10-4. The existence of a third body in the system could not be confirmed.

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