Supersonic Steady Accretion of a Rotating Cold "Iron Gas" onto a Neutron Star after Gravitational Collapse

Details Supersonic Steady Accretion of a Rotating Cold "Iron Gas" onto a Neutron Star after Gravitational Collapse Supersonic Steady Accretion of a Rotating Cold "Iron Gas" onto a Neutron Star after Gravitational Collapse

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001astl...27...81i&link_type=abstract

Astronomy Letters, vol. 27, p. 81-90 (2001)

Astronomy and Astrophysics

Astrophysics

4

Supernovae And Supernova Remnants, Plasma Astrophysics, Hydrodynamics, Shock Waves

Scientific paper

We analytically generalize the well-known solution of steady supersonic spherically symmetric gas accretion onto a star (Bondi 1952) for an iron atmosphere with completely degenerate electrons with an arbitrary degree of relativity. This solution is used for typical physical conditions in the vicinity of protoneutron stars produced by gravitational collapse with masses M_0 = (1.4 - 1.8) M_solar and over a wide range of nonzero "iron gas" densities at infinity, rho_inf = (10^4 - 5 x 10^6) g/cm^3. Under these conditions, we determine all accretion parameters, including the accretion rate, whose value is of about (10 - 50) M_solar/s at M_0 = 1.8 M_solar (it is a factor of 1.7 lower for M_0 = 1.4 M_solar, because the accretion rate is exactly proportional to M_0^2). We take into account the effect of accreting-gas rotation in a quasi-one-dimensional approximation, which has generally proved to be marginal with respect to the accretion rate.

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