Effects of Superfluidity on Nonradial Oscillations of Neutron Stars

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Session 13 -- Models or Gas Flows and Spectral Formation
Display presentation, Monday, 30, 1994, 9:20-6:30

[13.04] Effects of Superfluidity on Nonradial Oscillations of Neutron Stars

T.J.B.Collins, H.M.Van Horn (Univ. of Rochester), U.Lee (Ecole Normal Superiure de Lyon), R.Epstein (Los Alamos Natl. Lab)

In the limit of short wavelengths, it has been shown that superfluidity significantly affects wave propagation in neutron stars. Here we abandon the short-wavelength restriction and extend these calculations to global oscillation modes. In particular, we derive the equations of motion for spheroidal oscillations, including superfluid effects. These modes are global generalizations of one of the classes of waves considered previously. In the present modal analysis of a neutron star, we use a three component neutron star model, which consists of a fluid ocean, a solid crust, and a fluid core. The solid crust is divided into an outer crust and an inner crust, and a superfluid of neutrons coexists with the solid lattice in the inner crust. We have computed several low-order global spheroidal modes for $l=2$ both with and without superfluidity. We find that the existence of superfluid in the inner crust affects the frequency spectra of acoustic (p-) modes, shear (s-) modes, and interfacial modes, although the suface g-modes are not affected at all by the superfluid.

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