Computer Science
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989iaus..135p.507e&link_type=abstract
IAU Symposium No. 135: Interstellar dust: contributed papers, p. 507 - 514
Computer Science
Eruptive Stars: Circumstellar Grains, R Crb Stars: Circumstellar Grains
Scientific paper
The existence of gas and dust envelopes for many types of stars is well known. R CrB stars are classical examples of stars where dust envelope formation takes place. Dust envelope formation was detected around the Kuwano-Honda object (PU Vul) in 1980 - 1981 when the star's brightness fell to 8m. The explanation of all the observed features is difficult. One source of confusion may be due to the ignoring of change of optical parameters of dust particles as they grow during dust envelope formation from a thousandth part of a micrometer at the beginning to submicrometer size at the end of the process. In fact, all optical properties of dust grains are strongly dependent on the composition, shape, and size of the grains. Hence, for particles of any material and constant geometry, size variations lead to variations in the optical characteristics of particles. This implies that optical parameters of dust in the circumstellar envelope will change too.
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