| Issue |
A&A
Volume 394, Number 1, October IV 2002
|
|
|---|---|---|
| Page(s) | 213 - 217 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20021112 | |
| Published online | 04 October 2002 | |
Adiabatic index of dense matter and damping of neutron star pulsations
1
N. Copernicus Astronomical Center, Bartycka 18, 00-716 Warszawa, Poland e-mail: haensel@camk.edu.pl
2
Ioffe Physical Technical Institute, Politekhnicheskaya 26, 194021 St.-Petersburg, Russia e-mail: ksen@astro.ioffe.rssi.ru;yak@astro.ioffe.rssi.ru
Corresponding author: P. Haensel, haensel@camk.edu.pl
Received:
17
June
2002
Accepted:
30
July
2002
The adiabatic index 
for perturbations
of dense matter is studied
under various physical conditions which can prevail in neutron
star cores. The dependence of
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 
(depending on the composition of matter).
Key words: stars: neutron / dense matter / oscillations
© ESO, 2002
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