The unusual Cepheid HR 7308 with a variable amplitude

Details The unusual Cepheid HR 7308 with a variable amplitude The unusual Cepheid HR 7308 with a variable amplitude

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..666b&link_type=abstract

Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 666-672.

Astronomy and Astrophysics

Astrophysics

25

Cepheid Variables, Periodic Variations, Amplitudes, Electrophotometry, Fourier Analysis, Phase Shift, Stellar Models, Stellar Rotation

Scientific paper

HR 7308 is a classical Cepheid with the shortest known period. Photoelectric observations taken during 1966-1969 are presented and combined with recent work. The primary period of oscillation is found to be 1.49077 + or - 0.00001d, somewhat shorter than the previously published period. The amplitude of HR 7308 varies by over a factor of 5 with a period of about 1210d. An alternate period of 955d cannot be excluded due to the 1970-1977 gap in observations. Except for the variable amplitude, no secondary periods can be found in the data. The 0.71 period ratio, commonly found in short-period Cepheids, is absent. Various models utilizing two close periods have been used (leading to amplitude variations and phase jitter of the primary oscillation) as well as models of variable amplitudes superposed on a constant oscillation.

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