Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-10-27
MNRAS 402 1099--1110 (2010)
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
13 pages, 12 figures, and 3 tables; accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2009.15937.x
We perform ideal-magnetohydrodynamic axisymmetric simulations of magnetically confined mountains on an accreting neutron star, with masses less than ~0.12 solar masses. We consider two scenarios, in which the mountain sits atop a hard surface or sinks into a soft, fluid base. We find that the ellipticity of the star, due to a mountain grown on a hard surface, approaches ~2e-4 for accreted masses greater than ~1.2e-3 solar masses, and that sinking reduces the ellipticity by between 25% and 60%. The consequences for gravitational radiation from low-mass x-ray binaries are discussed.
Melatos Andrew
Vigelius Matthias
Wette Karl
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