Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245..683m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 2, May 1991, p. 683-686.
Astronomy and Astrophysics
Astrophysics
1
Accretion Disks, Compton Effect, Stellar Models, Conductive Heat Transfer, Cygnus Constellation, Magnetohydrodynamic Turbulence, Radiative Transfer, X Ray Sources
Scientific paper
Consideration is given to the idea of an unknown process responsible for the generation of viscosity, which is parameterized in the usual way, though not necessarily with alpha being assigned the meaning of a turbulent Mach number. The soft Comptonized two-temperature accretion disk is solved with the inclusion of the conductive energy transport, which is shown to be the main cooling mechanism in the hot inner two-temperature region. It is demonstrated that the size of the inner region grows as compared to the conduction free model and, if most of the radiation comes from that region, the flow is supersonic. The chief mechanisms usually invoked for turbulence generation, shear, and convective instabilities are found to be inoperative, which validates the assumption of turbulence not being developed. It is shown that magnetic fields are the most probable source of viscosity.
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