Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..694v&link_type=abstract
Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 694-707.
Astronomy and Astrophysics
Astronomy
19
Hydrogen Plasma, Stellar Luminosity, Stellar Mass Accretion, X Ray Sources, Adiabatic Flow, Axisymmetric Flow, Black Holes (Astronomy), Convective Flow, Flow Stability, Free Fall, Hydrodynamic Equations, Neutron Stars, Taylor Instability, Thermodynamic Equilibrium, Thomson Scattering, White Dwarf Stars
Scientific paper
Steady spherically symmetric accretion onto a compact object near the Eddington limiting luminosity is considered for an optically thick ionized hydrogen plasma. Solutions assuming LTE are treated in detail, with non-LTE flows being briefly discussed. In contrast to previous treatments, it is found that the spectrum peak for free-fall-type flows is likely to be in the X-ray regime and not at optical or UV energies. There also exist settling-type solutions for which these latter-type spectra are more realistic. An analysis of convection and Rayleigh-Taylor instabilities is also given. There appear to be a number of different regimes in the solutions which depend rather sensitively on the boundary conditions. The different solutions have been classified in a way that should prove useful both for building detailed models and for a further analysis of the stabilities of these flows.
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