Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..842g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. 842-852. NASA-supported research.
Astronomy and Astrophysics
Astronomy
67
Infrared Stars, R Coronae Borealis Stars, Spaceborne Astronomy, Stellar Envelopes, Stellar Evolution, Stellar Spectrophotometry, Supergiant Stars, Emission Spectra, Infrared Astronomy Satellite, Interstellar Matter, Radiant Flux Density, Stellar Luminosity, Stellar Models
Scientific paper
IRAS observations reveal a ≡18arcmin diameter, nearly symmetrical 60 and 100 μm emission region centered on the extreme hydrogen-deficient supergiant, R CrB. If R CrB is at a distance of 1.6 kpc, the shell has a linear extent of ≡8 pc, and luminosity of about 28 L_sun;. The dust temperature is 25 - 30K, and the radiating dust mass is 0.1×10-2M_sun; to 2.4×10-2M_sun;, depending on the assumed grain optical properties. The corresponding total shell mass, for solar abundances, is at least 0.25 M_sun;. The dust shell is tentatively identified as a fossil remnant of R CrB's hydrogen-rich envelope. The ejection process appears to have occurred with a nearly constant mass loss rate and expansion velocity over a period of about 1.5×105yr, terminating about 2.6×104yr ago.
Backman Dana E.
Beichman Ch.
Gillett Fred C.
Neugebauer Gernot
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