Discs and haloes in pre-main-sequence stars (CROSBI ID 134431)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Vinković, Dejan ; Ivezić, Željko ; Miroshnichenko, Anatoly S. ; Elitzur, Moshe
engleski
Discs and haloes in pre-main-sequence stars
We study the infrared (IR) emission from flared discs with and without additional optically thin haloes. Flux calculations of a flared disc in vacuum can be considered a special case of the more general family of models in which the disc is imbedded in an optically thin halo. In the absence of such a halo, flux measurements can never rule out its existence because the disc flaring surface defines a mathematically equivalent halo that produces the exact same flux at all IR wavelengths. When a flared disc with height H at its outer radius R is imbedded in a halo whose optical depth at visual wavelengths is τ halo, the system IR flux is dominated by the halo whenever τ halo > (1/4)H/R. Even when its optical depth is much smaller, the halo can still have a significant effect on the disc temperature profile. Imaging is the only way to rule out the existence of a potential halo, and we identify a decisive test that extracts a signature unique to flared discs from imaging observations.
radiative transfer – circumstellar matter – stars: formation – stars: imaging – stars: pre-main-sequence – dust; extinction
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Fizika, Informacijske i komunikacijske znanosti