Cepheid studies. I. Mode interaction in the beat Cepheid U Trianguli Australis.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1977
- DOI:
- 10.1086/155442
- Bibcode:
- 1977ApJ...216...49F
- Keywords:
-
- Cepheid Variables;
- Fourier Analysis;
- Pulsed Radiation;
- Stellar Spectra;
- Electrophotometry;
- Periodic Variations;
- Spectrum Analysis;
- Stellar Spectrophotometry;
- Vibration Mode;
- Astrophysics