Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183..687s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 183, June 1978, p. 687-700.
Astronomy and Astrophysics
Astronomy
13
Collision Rates, Hydrodynamics, Main Sequence Stars, Nuclear Reactions, Stellar Models, White Dwarf Stars, Boundary Value Problems, Computerized Simulation, Galactic Evolution, Galactic Nuclei, Gravitational Effects, Stellar Luminosity, Stellar Mass
Scientific paper
Two-dimensional hydrodynamic simulations of head-on collisions between a 1-solar-mass white dwarf and 0.13-solar-mass main-sequence star have been performed. The impact velocities at first contact were 2000 and 6000 km/s in the two cases considered. These speeds corresponded to relative velocities of the stars, at infinity, of 300 and 5700 km/s, respectively. Temperatures of 300-500 million are achieved by most of the main-sequence star mass, and nuclear reactions release over 10 to the 49th power erg in approximately 1 hr. Accretion of main-sequence star mass by the white dwarf is followed by a dynamic ejection episode, which totally disrupts the nondegenerate star and leaves the white dwarf intact. The results demonstrate that the disruptive process considered is as important as the amalgamative collisions considered previously. Such disruptive collisions should sharply modify the luminosity function, the luminosity, the energy balance, and the evolution of dense galactic nuclei.
Shara Michael M.
Shaviv Giora
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