Portal de Periódicos da CAPES

What is the pulsation period of R Coronae Borealis?

1991; Oxford University Press; Volume: 253; Issue: 4 Linguagem: Inglês

10.1093/mnras/253.4.625

1365-2966

W. A. Lawson,

Geological and Geophysical Studies

A Fourier analysis of recently published photometry of R Coronae Borealis (R CrB) has indicated 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 ~ 44-d periodicity. There is no evidence for a coherent ~ 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.