Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...209l...5j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 209, no. 1-2, Jan. 1989, p. L5-L8.
Astronomy and Astrophysics
Astrophysics
34
Gravitational Collapse, Neutrinos, Neutron Stars, Protostars, Stellar Cores, Supernovae, Anisotropy, Metallicity, Particle Emission, Stellar Rotation, Supernova 1987A
Scientific paper
Numerical simulations of the collapse of rotating stellar iron cores yield a significant deformation of the hydrostatic configurations after core bounce. This causes asphericities of the neutrino cooling flow in the sense that observers looking from positions close to the rotation axis 'see' a neutrino flux which may be up to a factor of three higher than that received by observers in the equatorial plane. Therefore, the evaluation of neutrino signals from stellar core collapse events suffers from a corresponding uncertainty as long as no evidence about the amount of rotation and the orientation of the rotation axis is available. By imposing limits on the neutron star binding energy deduced from bounds of the iron core mass of a 15-20 solar-mass star, the Kamiokande II data exclude the possibility that the formation of a rapidly rotating neutron star in SN 1987A has been seen from a position close to the equatorial plane.
Janka H.-Th.
Moenchmeyer R.
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