Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..93..185k&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 93, no. 1, June 1983, p. 185-197.
Astronomy and Astrophysics
Astrophysics
11
Gravitational Collapse, Neutron Stars, Pions, Stellar Cores, Stellar Models, Hydrodynamics, Supernovae
Scientific paper
The transition from a neutron star to a pion-condensed star is investigated in Newtonian hydrodynamics. It is shown that in a certain range of ultradense equations of state, there occurs a mass ejection with energies comparable with usual supernova outputs. But the ejected mass is only in the order of 0.02 M_sun;. Therefore, the observable consequences of this transition are not so dramatic as conjectured recently. In a realistic scenario including a stiff ultradense equation of state and a weak effect of pion condensation the mass ejection disappears. Additionally the collapse of a stellar core to a neutron star with pion-condensed core is considered. In comparison with a standard supernova scenario the author finds only a slightly reduced explosion energy. Further, the possible consequence of pion condensation during the secular evolution of the bounced core of a collapsing star to the cool final neutron star is discussed.
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