Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-12-06
Astrophys.J. 550 (2001) 860-862
Astronomy and Astrophysics
Astrophysics
AASTeX, 8 pages, including 1 PS figure. Accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/319823
A general thermodynamic argument shows that multi-component matter in full chemical equilibrium, with uniform entropy per baryon, is generally stably stratified. This is particularly relevant for neutron stars, in which the effects of entropy are negligible compared to those of the equilibrium composition gradient established by weak interactions. It can therefore be asserted that, regardless of the uncertainties in the equation of state of dense matter, neutron stars are stably stratified. This has important, previously discussed consequences for their oscillation modes, magnetic field evolution, and internal angular momentum transport.
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