Spherical Accretion onto Neutron Stars Revisited: Are Hot Solutions Possible ?

Details Spherical Accretion onto Neutron Stars Revisited: Are Hot Solutions Possible ? Spherical Accretion onto Neutron Stars Revisited: Are Hot Solutions Possible ?

1994-02-21

arxiv.org/abs/astro-ph/9402051v1

Astronomy and Astrophysics

Astrophysics

11 pages (3 postscript files figures available on request), PlainTeX, Ref. SISSA 21/94/A

Scientific paper

10.1086/187333

Stationary, spherical accretion onto an unmagnetized neutron star is here reconsidered on the wake of the seminal paper by Zel'dovich \& Shakura (1969). It is found that new ``hot'' solutions may exist for a wide range of luminosities. These solutions are characterized by a high temperature, $10^{9}\div 10^{11}$ K, and arise from a stationary equilibrium model where the dominant radiative mechanisms are multiple Compton scattering and bremsstrahlung emission. For low luminosities, $\mincir 10^{-2} \ L_{E}$, only the ``cold'' (\`a la Zel'dovich and Shakura) solution is present.

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