Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389..386d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 10, 1992, p. 386-391. Research supported by ASI.
Astronomy and Astrophysics
Astronomy
15
Angular Momentum, Black Holes (Astronomy), Gravitational Collapse, Neutron Stars, Pre-Main Sequence Stars, Stellar Evolution, Stellar Rotation, Astronomical Models, Computerized Simulation, Constraints, Protostars, Relativistic Theory, Stellar Mass, Stellar Models
Scientific paper
The paper evaluates the values of the a/m ratio predicted by numerical models describing rotating stellar configurations, at the two extremes of the stellar evolution, the protostellar phase, and the neutron star phase. It is shown that previous 3D hydrodynamical calculations provide a systematic decrease of the a/m ratio by an average factor of about 0.42 through fragmentation at the end of the isothermal regime. It is argued that a likely consequence of this sensitivity of a/m is the occurrence of a minimum in its behavior along the sequence of relativistic stellar configurations as one moves in the direction of increasing energy density. This feature appears to fade away in fast rotating systems, indicating a model dependency of that ratio, which may constrain significantly any modeling of the collapse to a final state.
de Felice Fernando
Di Sigalotti Leonardo G.
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