The period of EM Cephei - Constant or variable

Details The period of EM Cephei - Constant or variable The period of EM Cephei - Constant or variable

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..432b&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 92, Aug.-Sept. 1980, p. 432-457.

Astronomy and Astrophysics

Astronomy

12

Cepheid Variables, Eclipsing Binary Stars, Light Curve, Stellar Spectrophotometry, Brightness, Electrophotometers, Tables (Data), Ubv Spectra

Scientific paper

Details of a recent photoelectric three-color photometry and an unpublished series of earlier UBV observations of the system EM Cep are presented. It is suggested that the previously reported light-curve anomalies result from abrupt transitions between two distinct modes of light variation with different amplitudes rather than from continuous changes of the light curve. An extension of the (O-C) diagram until 1978 is interpreted in terms of only a marginal secular decrease of the period.

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