Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988azh....65..979e&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 65, Sept.-Oct. 1988, p. 979-987. In Russian.
Astronomy and Astrophysics
Astronomy
9
Astronomical Photometry, Colorimetry, Cosmic Dust, Light Curve, Stellar Envelopes, Particle Size Distribution, Stellar Color, Stellar Luminosity
Scientific paper
It is shown that peculiarities of light and color variations observed at the time of deep minima of R CrB may be due to the variations of optical properties of particles when the size of particles changes at the time of circumstellar dust envelope formation. The dependence of the wavelength of extinction maximum on the particles' size leads to the wavelength dependence of time delay of minima: the long-wave minima occur after short-wave minima. It results in color variations: the reddening at the decline of light is replaced by the bluing at the minimum level of the star's brightness.
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