Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992azh....69.1195p&link_type=abstract
Astronomicheskij Zhurnal (ISSN 0004-6299), vol. 69, no. 6, p. 1195-1206.
Astronomy and Astrophysics
Astronomy
4
Brightness Distribution, Cosmic Dust, Light Curve, Molecular Clouds, Normal Density Functions, R Coronae Borealis Stars, Astronomical Photometry, Interstellar Matter, Numerical Integration
Scientific paper
A grid of possible light curves of R CrB-type stars is computed for the case of eclipse of the star's visible disk by an inhomogeneous cloud which originated at an arbitrary projected distance from the star. It is assumed in the simplest case that the matter density distribution within the cloud follows a Gaussian law, and the cloud expansion velocity is constant. A comparison with observations is made. From the depth and duration of actual fadings of brightness, the mass of the cloud and the projected distance to its center from the star are determined in each concrete case by the fitting method. Both fast and protracted R CrB brightness minima of various amplitudes can be accounted for by varying these two parameters.
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