Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..302h&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 1, 1981, p. 302-307.
Astronomy and Astrophysics
Astrophysics
15
Asteroids, Collision Parameters, Gamma Ray Bursts, Neutron Stars, Stellar Models, Hydrodynamic Equations, Meteorite Collisions, Optical Thickness, Planetary Radiation, Stellar Mass Accretion
Scientific paper
A zero impact parameter collision of a 5 x 10 to the 17th g asteroid with a 1.51 solar mass neutron star using a two-dimensional Lagrangian-Eulerian hydrodynamics code is calculated. The radiation transfer is followed with a Planckian LTE diffusion model, and allowed to couple to the matter through bremsstrahlung and Compton processes. The effects of self-gravity on the asteroid, relativity, and magnetic fields are not included. The kinetic energy of impact is converted into radiant energy within 1 ms of impact. However, the neutron star is rapidly (less than 1 ms) covered by a low-density optically thick cloud that radiates within an order of magnitude of the Eddington limit at an effective temperature of only a few keV. Thus, such models, without the inclusion of confinement effects such as magnetic fields, are insufficient to explain cosmic gamma-ray bursts or the 1979 March 5 event.
Barton R. T.
Howard Michael W.
Wilson Richard J.
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