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WEAKLY MASS-LOADED ACCRETION DISCS

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Accretion discs with an additional mass input on the disc surface from the environment are considered in the limit of a low mass input rate, when the accretion flow remains Keplerian. Owing to dissipation of kinetic energy of the infalling gas, the disc temperature increases and can deviate significantly from standard temperature of reprocessing accretion discs in their outer regions. This increase in temperature produces an excess of emission in a long-wavelength range of the disc spectrum. An illustrative example of the spectrum of a weakly mass-loaded disc (the surface mass input rate $\dot{M}_{\rm load}\approx 1.5\times 10^{-8}M_{\odot}\,\hbox{year}^{-1}$) reasonably reproducing the far-infrared excess observed in CS Chameleon is given.
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Keywords: Accretion discs; Additional mass input; Far-infrared excess; Keplerian accretion flow

Document Type: Research Article

Affiliations: Department of Physics, University of Rostov, Rostov on Don 344090, Russia

Publication date: 2003-02-01

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