期刊
ASTRONOMY & ASTROPHYSICS
卷 394, 期 1, 页码 213-217出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20021112
关键词
stars : neutron; dense matter; oscillations
The adiabatic index Gamma(1) for perturbations of dense matter is studied under various physical conditions which can prevail in neutron star cores. The dependence of Gamma(1) on the composition of matter (in particular, on the presence of hyperons), on the stellar pulsation amplitude, and on the baryon superfluidity is analyzed. Timescales of damping of stellar pulsations are estimated at different compositions, temperatures, and pulsation amplitudes. Damping of pulsations by bulk viscosity in the neutron-star cores can prevent the stars to pulsate with relative amplitudes greater than or similar to (1-15)% (depending on the composition of matter).
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