Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...159l...5s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 159, no. 1-2, April 1986, p. L5-L7. Research supported by the Technion Foundat
Astronomy and Astrophysics
Astrophysics
80
Accretion Disks, Stellar Atmospheres, Stellar Coronas, Stellar Evolution, Temperature Distribution, Vertical Distribution, Optical Thickness, Radiative Heat Transfer, Stellar Models, Thermal Instability
Scientific paper
The authors formulate the radiative transfer problem for an accretion disc and solve for the vertical stratification and radiation field consistently. The method developed can treat any form of energy generation law. The authors show that if for example, the alpha-model is assumed throughout the photosphere a thermal instability develops even for discs which are optically thick. They hypothesise that this instability leads to the formation of a corona. The authors find also that the temperature distribution is very flat even in the optically thick regions and the disc height (z(τ = 1)) is significantly greater than the classical value one obtains from global considerations.
Shaviv Giora
Wehrse Rainer
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