Adiabatic Index of Dense Matter and Damping of Neutron Star Pulsations

Details Adiabatic Index of Dense Matter and Damping of Neutron Star Pulsations Adiabatic Index of Dense Matter and Damping of Neutron Star Pulsations

2002-08-03

arxiv.org/abs/astro-ph/0208078v1

Astron.Astrophys. 394 (2002) 213-218

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20021112

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 > (1-15)% (depending on the composition of matter).

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