Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265...82r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 82-105.
Astronomy and Astrophysics
Astrophysics
60
Collisions, Main Sequence Stars, White Dwarf Stars, Binary Stars, Globular Clusters, Shock Waves, Stellar Mass Ejection
Scientific paper
The 3D hydrodynamic evolution of a collision between a 0.5 solar mass white dwarf and a 0.5 solar mass main-sequence star is investigated. The hydrodynamics is modeled by the piecewise parabolic method. The initial separation of the stars is two stellar radii, and they approach each other on parabolic orbits. The resolution in the vicinity of the white dwarf is increased by multiply nesting refined grids around the white dwarf, which makes it possible to follow the evolution of central, off-center, and grazing collisions for up to 20 h. The grazing encounter produces a bound orbit in which the white dwarf accretes matter from the deformed star; in a second collision the main-sequence star is finally disrupted and forms a disk. Only a little mass (about 10 percent for the grazing collisions, and up to 40 percent for the central collisions) is expelled from the system.
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