The dust around R Coronae Borealis type stars

Details The dust around R Coronae Borealis type stars The dust around R Coronae Borealis type stars

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280..228h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 1, 1984, p. 228-234.

Astronomy and Astrophysics

Astronomy

85

Carbon Stars, R Coronae Borealis Stars, Stellar Envelopes, Ultraviolet Astronomy, Variable Stars, Interstellar Extinction, Interstellar Matter, Optical Thickness

Scientific paper

Measurements taken by the International Ultraviolet Explorer spacecraft of the stars RY Sgr and R CrB have been analyzed using Mie theory. The extinction data, which show a 2400-2500 A peak, are consistent with a distribution of 5-60 nm glassy or amorphous carbon particles obscuring the stellar flux. The data are also fairly consistent with a cloud ejection model. Since the extinction data lack the commonly observed peak at 2170 A, it is proposed that this difference is due to the conditions present when the dust condenses. Interstellar carbon grains appear to originate in normal carbon stars which are carbon and hydrogen rich. In contrast, the grains around R CrB type stars seem to condense from a carbon-rich and hydrogen-poor vapor.

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