Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307..644s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 307, Aug. 15, 1986, p. 644-648.
Astronomy and Astrophysics
Astronomy
17
Infrared Astronomy, Peculiar Stars, Planetary Nebulae, R Coronae Borealis Stars, Variable Stars, Astronomical Catalogs, Power Spectra, Stellar Envelopes, Stellar Evolution, White Dwarf Stars
Scientific paper
IRAS observations of R Coronae Borealis type stars (R CrB's) suggests that a subset of these is inside planetary nebulae (PNs). In most cases, the PN is confirmed by the finding of a visible nebula around the star. These nebular R CrB's are identified as being the results of a final helium shell flash on the central star of old PNs. The majority of the R CrB's formed after the coalescence of a binary consisting of CO and He white dwarfs. Also presented in this paper are the results of a survey of 52 R CrB's. The normal R CrB's have power-law spectra which imply that the grain absorption coefficient varies linearly with frequency. It is estimated that R CrB's eject about 300 clouds per year, each of which subtend an angle of about 30 sq deg.
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