Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..625l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 15, 1991, p. 625-632.
Astronomy and Astrophysics
Astronomy
14
R Coronae Borealis Stars, Stellar Oscillations, Stellar Spectrophotometry, Fourier Analysis, Light Curve
Scientific paper
A Fourier analysis of recently published photometry of R Coronae Borealis (R CrB) indicates that the star may be multiperiodic. Photometry obtained during 1986-89 is best represented by a coherent 51.8-d periodicity. In addition, there is evidence that the strong amplitude modulation of the light curve during this time is due to the interaction between this periodicity and a 56.2-d periodicity. However, during 1985 and 1990, the light curve indicates the presence of an approximately 44-d periodicity. There is no evidence for a coherent approximately 44-d periodicity being present during 1986-89. Random phase changes of a 44-d periodicity could account for the appearance of the light curve during 1986-89, but such phase changes would have to be frequent and substantial. The interaction between the periodic nature of the star and the onset of declines is also examined. A claim that the time of onset of declines of R CrB can be linked to any one of three possible periodicities is not supported by this analysis.
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