منابع مشابه
Secular Instability of g-Modes in Rotating Neutron Stars
Gravitational radiation tends to drive gravity modes in rotating neutron stars unstable. For an inviscid star, the instability sets in when the rotation frequency is about 0.7 times the corresponding mode frequency of the nonrotating star. Neutron stars with spin frequencies > ∼ 100 Hz are susceptible to this instability, with growth time of order years. However, it is likely that viscous dissi...
متن کاملThermal g-modes and unexpected convection in superfluid neutron stars
We suggest that specific thermal low-frequency g-modes can exist in superfluid neutron stars. They can be excited in the matter with a nonzero gradient of entropy per electron. We determine the Brunt-Väisälä frequency for these modes and demonstrate that they can be unstable with respect to convection. The criterion for the instability onset (analogue of the well-known Schwarzschild criterion) ...
متن کاملRelativistic g-modes in rapidly rotating neutron stars
We study the g-modes of fast rotating neutron in the general relativistic Cowling approximation. Our background models take into account the buoyant force due to composition gradients. We compare the Newtonian results of Passamonti et al. (2009) with our relativistic ones and we find an excellent qualitative agreement.
متن کاملA NEW CLASS OF g-MODES IN NEUTRON STARS
Beca~se. a n~utron star is ~orn hot, its internal composition is close to chemical equilibrium. In the fluid core, thts tmphes_ that _the rat!o of the_ number densities of charged particles (protons and electrons) to neutrons, x ~.ncfnn, ts an mcreasmg function of the mass density. This composition gradient stably stratifies the m~tter glVlng ~ise to a Br~nt-Viiisiilii frequency N ~ (xgj2H) 112...
متن کاملr-modes in superfluid neutron stars
The analogues of r-modes in superfluid neutron stars are studied here. These modes, which are governed primarily by the Coriolis force, are identical to their ordinary-fluid counterparts at the lowest order in the small angular-velocity expansion used here. The equations that determine the next order terms are derived and solved numerically for fairly realistic superfluid neutron-star models. T...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1987
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/227.2.265