The R Coronae Borealis Stars

Details The R Coronae Borealis Stars The R Coronae Borealis Stars

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasp..108..225c&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.108, p.225

Astronomy and Astrophysics

Astronomy

167

Stars: Emission-Line, Circumstellar Matter, Stars: Evolution, Invited Review Paper

Scientific paper

This year marks the bicentennial of the discovery of the variability of R Coronae Borealis. The R Coronae Borealis (RCB) stars are distinguished from other hydrogen-deficient objects by their spectacular dust formation episodes. They may decline by up to 8 magnitudes in a few weeks revealing a rich emission-line spectrum. Their atmospheres have unusual abundances with very little hydrogen and an overabundance of carbon and nitrogen. The RCB stars are thought to be the product of a final helium shell flash or the coalescence of a binary white-dwarf system. Dust may form in non-equilibrium conditions created behind shocks caused by pulsations in the atmospheres of these stars. The RCB stars are interesting and important, first because they represent a rare, or short-lived stage of stellar evolution, and second because these stars regularly produce large amounts of dust so they are laboratories for the study of dust formation and evolution. (SECTION: Invited Review Paper)

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