The fading of R Coronae Borealis

Details The fading of R Coronae Borealis The fading of R Coronae Borealis

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..497h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, June 1987, p. 497-508. Research supported by the Ae

Astronomy and Astrophysics

Astronomy

29

R Coronae Borealis Stars, Stellar Envelopes, Stellar Spectra, Supergiant Stars, Ultraviolet Spectra, Variable Stars, Carbon Stars, Interstellar Extinction, Iue, Stellar Spectrophotometry

Scientific paper

Using the International Ultraviolet Explorer (IUE) low-resolution spectra were obtained of R CrB, the prototype of its class of variable stars, shortly after the beginning of its 1983-84 minimum and during its rise to maximum again. The behavior of the spectra during the rise to maximum is similar to the behavior of the spectra of RY Sgr during a similar phase in 1979-80. The extinction data have been analyzed using Mie theory and are consistent with the stellar photosphere being obscured by 20-nm glassy carbon particles. The observations during the decline to minimum show substantial spectral variations which cannot be explained in terms of simple continuum absorption. An interpretation of the observed behavior in terms of a model incorporating an occulting cloud and circumstellar emission is offered.

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