Cepheid studies. I - Mode interaction in the beat Cepheid U Trianguli Australis

Details Cepheid studies. I - Mode interaction in the beat Cepheid U Trianguli Australis Cepheid studies. I - Mode interaction in the beat Cepheid U Trianguli Australis

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216...49f&link_type=abstract

Astrophysical Journal, Part 1, vol. 216, Aug. 15, 1977, p. 49-56.

Astronomy and Astrophysics

Astrophysics

27

Cepheid Variables, Fourier Analysis, Pulsed Radiation, Stellar Spectra, Electrophotometry, Periodic Variations, Spectrum Analysis, Stellar Spectrophotometry, Vibration Mode

Scientific paper

Photoelectric observations of the beat Cepheid U TrA, previously reported by Oosterhoff (1957) and Jansen (1962), have been reanalyzed using Fourier techniques. The two reported periods have been confirmed, and it has been shown that no further statistically significant periodicity is present. The two observed modes are subject to a strong mode interaction, but it is not yet clear whether this will have any implications for the beat masses derived for double-mode Cepheids. If U TrA is currently 'mode switching', the change in relative mode amplitudes since these observations were made should be readily detectable.

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