The R Coronae Borealis stars - I. Infrared photometry and long-term variations

Details The R Coronae Borealis stars - I. Infrared photometry and long-term variations The R Coronae Borealis stars - I. Infrared photometry and long-term variations

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.285..317f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 285, Issue 2, pp. 317-338.

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40

Stars: Agb And Post-Agb, Stars: Chemically Peculiar, Circumstellar Matter, Stars: Mass-Loss, Stars: Variables: Other, Infrared: Stars.

Scientific paper

Extensive JHKL photometry is given for 12 R Coronae Borealis (RCB) stars, covering periods of up to 23 years. Limited infrared observations of a few other RCB stars and five HdC stars are also reported. These data are used to study the long-term variations of the stars (at J) and of the circumstellar dust (at L). All of the RCB stars show variations in the flux from the dust on time-scales of from a few hundred days to a few thousand days. Dust flux amplitudes at L of up to 3mag are found, the larger amplitudes being associated with the longer time-scales. Secular variations over about 10000d are also sometimes seen. R CrB itself is atypical in showing evidence of semiregular variations (period ~1260d). There is no direct relation between the occurrence of obscuration minima and changes in the flux from the dust. However, there is possibly a statistical relation between the dust flux and the frequency of the obscuration minima. Models involving fixed geometry for the ejection of dust from the star appear to be ruled out and the data support the random dust-puff model. High infrared excesses and high levels of obscuration activity seem to be associated with a higher than average hydrogen abundance.

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