Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-08
Mon.Not.Roy.Astron.Soc.365:929-938,2006
Astronomy and Astrophysics
Astrophysics
21 pages, 8 figres. Submitted to MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09773.x
In this paper we compute the gravitational signal emitted when a white dwarf moves around a black hole on a closed or open orbit using the affine model approach. We compare the orbital and the tidal contributions to the signal, assuming that the star moves in a safe region where, although very close to the black hole, the strength of the tidal interaction is insufficient to provoque the stellar disruption. We show that for all considered orbits the tidal signal presents sharp peaks corresponding to the excitation of the star non radial oscillation modes, the amplitude of which depends on how deep the star penetrates the black hole tidal radius and on the type of orbit. Further structure is added to the emitted signal by the coupling between the orbital and the tidal motion.
Casalvieri C.
Ferrari Valeria
Stavridis Adamantios
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