Nonuniqueness of stationary accretion in the Shakura model

Details Nonuniqueness of stationary accretion in the Shakura model Nonuniqueness of stationary accretion in the Shakura model

2006-10-25

arxiv.org/abs/astro-ph/0610747v1

J.Phys.Conf.Ser.66:012062,2007

Astronomy and Astrophysics

Astrophysics

9 pages, 1 figure, talk presented during the XXIX Spanish Relativity Meeting (ERE 2006): Einstein's Legacy: From the Theoretic

Scientific paper

10.1088/1742-6596/66/1/012062

We investigate the accretion onto luminous bodies with hard surfaces within the framework of newtonian theory. The accreting gases are assumed to be polytropes and their selfgravitation is included. A remarkable feature of the model is that under proper boundary conditions some parameters of the sonic point are the same as in the Bondi model and the relation between luminosity and the gas abundance reduces to an algebraic relation. All that holds under assumptions of stationarity and spherical symmetric. Assuming data that are required for the complete specification of the system, one finds that generically for a given luminosity there exist two solutions with different compact cores.

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