Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..216g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 216-236.
Astronomy and Astrophysics
Astrophysics
42
Cosmic Dust, R Coronae Borealis Stars, Stellar Envelopes, Stellar Models, Buckminsterfullerene, Light Curve
Scientific paper
The paper investigates the conditions of the formation of pure carbon dust in the envelopes of R CrB stars. On the basis of a sketchy equilibrium chemistry of the condensation process, a model is presented which is able to explain the occasional onset of the decline events as well as their development. The descending and the ascending branches of a theoretical light curve are calculated, and are in good agreement with the observations. The calculations result in the prediction of small grain sizes and some parameters directly observable. The sensitivity of the release mechanism against anisotropy readily explains a nonspherical distribution of the dust and thus corresponds with the occurrence of IR excess during light maximum. The model thus strongly supports the idea of cloudy dust formation in the line of sight and the dilution of the dust in radial direction.
Goeres Achim
Sedlmayr Erwin
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