Optical Properties of the Circumstellar Dust around Stars with Aperiodic Fadings

Details Optical Properties of the Circumstellar Dust around Stars with Aperiodic Fadings Optical Properties of the Circumstellar Dust around Stars with Aperiodic Fadings

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004arep...48..470p&link_type=abstract

Astronomy Reports, Volume 48, Issue 6, pp.470-475

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Multicolor observations of 21 rapid, irregular variable stars with Algol-like fadings and of R Coronae Borealis are used to derive the optical extinction coefficients of the circumstellar dust associated with these objects, θ(λ). We used more than 3600 uniform multi-color brightness measurements obtained in a rigorous U BV R system at the Terskol High-altitude Observing Station. The mean extinction coefficient θ for the circumstellar dust for this sample of stars coincides almost exactly with the interstellar extinction coefficient, θis, but is somewhat higher in the ultraviolet. We suggest an explanation for this difference.

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