Photoelectric UBV Photometry of Northern Cepheids I

Details Photoelectric UBV Photometry of Northern Cepheids I Photoelectric UBV Photometry of Northern Cepheids I

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977cokon..70....1s&link_type=abstract

Communications of the Konkoly Observatory, No. 70 (Vol. VII, 5), p. 1-123 (1977)

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28

Scientific paper

New UBV photoelectric observational data on 38 northern cepheids with periods of less than 5 days are presented. The period changes of the observed cepheids are investigated. Four variables (SU Cyg, DT Cyg, V532 Cyg, SZ Tau) show a period jump and a subsequent 'rejump' to the earlier value of the period, which results in the overall constancy of the period. DT Cyg pulsates with the same period for at least the fourth time which is in keeping with the recent hypothesis on the evolution of cepheids along the lines of constant period in the HRD. AU peg, a Population II variable, shows extremely strong period changes. In three cases, secular light curve variation was discovered. The amplitude of the light variation as AS Per is decreasing; the other type of light curve variation is the variation in the steepness of the rising branch (SU Cyg, FF Aql). The effect of the orbital motion on the O-C diagram is also investigated for FF Aql. Finally, the instability of the period for different types of cepheids is discussed.

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