Cepheid studies. III - Energy changes in the beat Cepheid U Trianguli Australis

Details Cepheid studies. III - Energy changes in the beat Cepheid U Trianguli Australis Cepheid studies. III - Energy changes in the beat Cepheid U Trianguli Australis

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..197f&link_type=abstract

Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 197-204.

Astronomy and Astrophysics

Astrophysics

15

Astronomical Spectroscopy, Cepheid Variables, Ubv Spectra, Amplitudes, Astronomical Catalogs, Coupled Modes, Fourier Analysis, Light Curve, Phase Deviation

Scientific paper

Four hundred and eighty-one UBVRI observations of the beat Cepheid U TrA obtained in the 1977 season are reported. The V luminosities have been Fourier analyzed to provide both improved estimates for the periods, and amplitude and phase values for the double-mode Fourier terms. A comparison with extensive observations made 18 years ago indicates that there has been a redistribution of pulsation energy in favor of the first overtone at the expense of the fundamental. It is postulated that this is not due to mode-switching, but rather to the intermode coupling that exists between the two pulsations.

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