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A Photoelectric Investigation of the Double Cepheid CE Cas

Published online by Cambridge University Press:  14 August 2015

Otto G. Franz  and
Otto G. Franz
Otto G. Franz
Affiliation:
Lowell Observatory, Flagstaff, Ariz. 86001, U.S.A.
Otto G. Franz
Affiliation:
Lowell Observatory, Flagstaff, Ariz. 86001, U.S.A.

Abstract

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A photoelectric area scanner (Franz, 1970) was used to carry out photometry of the separate components of the double Cepheid CE Cas, a binary of 2.5″ separation located in NGC 7790. CE Cas A was found to undergo rapid fluctuations as well as a slow change of its brightness near minimum phase, while its brightness at maximum has remained the same over more than 10 yr. The absence of the effect from the observations of CE Cas B and evidence for its presence in earlier observations by Sandage and Tammann (1969) serve to establish the reality of this phenomenon. Manifestation of this effect during early phases of this investigation had led to the erroneous conclusion that CE Cas A had undergone a significant change of period in recent years (Franz, 1972).

Type
Part 3 / Type I (Classical) Cepheids
Information
Symposium - International Astronomical Union , Volume 67: Variable Stars and Stellar Evolution , 1975 , pp. 191
Copyright
Copyright © Reidel 1975 

References

Franz, O. G.: 1970, Lowell Obs. Bull., No. 154, 191.Google Scholar
Franz, O. G.: 1972, Bull. Am. Astron. Soc. 4, 329.Google Scholar
Sandage, A. and Tammann, G. A.: 1969, Astrophys. J. 157, 683.CrossRefGoogle Scholar