Neutron star asteroseismology. Axial crust oscillations in the Cowling approximation

By L. Samuelsson, N. Andersson. 2006

145 citations recorded by the source corpus.

Recent observations of quasi-periodic oscillations in the aftermath of giant flares in soft gamma-ray repeaters suggest a close coupling between the seismic motion of the crust after a major quake and the modes of oscillations in a magnetar. In this paper, we consider the purely elastic modes of oscillation in the crust of a neutron star in the relativistic Cowling approximation (disregarding any magnetic field). We determine the axial crust modes for a large set of stellar models, using a state-of-the-art crust equation of state and a wide range of core masses and radii. We also devise useful approximate formulae for the mode-frequencies. We show that the relative crust thickness is well described by a function of the compactness of the star and a parameter describing the compressibility of the crust only. Considering the observational data for SGR 1900+14 and SGR 1806?20, we demonstrate how our results can be used to constrain the mass and radius of an oscillating neutron star.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/5d9ad8914f69b1485be91bce509d46c262cadf73

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

THE EQUATION OF STATE FROM OBSERVED MASSES AND RADII OF NEUTRON STARS (2010, background): “These include neutron star seismology (Samuelsson & Andersson 2007; Steiner & Watts 2009), pulse profiles in X-ray pulsars (Leahy et al. 2009; Morsink & Leahy 2009), and momentof inertia measurements in relativistic binaries (Lattimer & Schutz 2005).”
CONSTRAINING THE SYMMETRY PARAMETERS OF THE NUCLEAR INTERACTION (2012, background): “The symmetry energy also affects the crust’s thickness and thermal relaxation time, observable in cooling and accreting (Page & Reddy 2012) neutron stars and in giant magnetar flares (Hurley et al. 2005; Thompson & Duncan 2001; Samuelsson & Andersson 2007).”