Self-Similar Hot Accretion onto a Spinning Neutron Star: Matching the Outer Boundary Conditions

Details Self-Similar Hot Accretion onto a Spinning Neutron Star: Matching the Outer Boundary Conditions Self-Similar Hot Accretion onto a Spinning Neutron Star: Matching the Outer Boundary Conditions

2003-04-30

arxiv.org/abs/astro-ph/0305002v1

Mon.Not.Roy.Astron.Soc. 343 (2003) 1007

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure, MNRAS accepted

Scientific paper

10.1046/j.1365-8711.2003.06747.x

Medvedev & Narayan have described a hot accretion flow onto a spinning neutron star in which the gas viscously brakes the spin of the star. Their self-similar solution has the surprising property that the density, temperature and angular velocity of the gas at any radius are completely independent of the outer boundary conditions. Hence, the solution cannot be matched to a general external medium. We resolve this paradoxical situation by showing that there is a second self-similar solution which bridges the gap between the original solution and the external medium. This new solution has an extra degree of freedom which permits it to match general outer boundary conditions. We confirm the main features of the analytical results with a full numerical solution.

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