Luminosities of Disk-accreting Non-magnetic Neutron Stars

Physics

Scientific paper

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Stars: Neutron, Equation Of State, Stars: Rotation, Stars: Accretion, General Relativity

Scientific paper

Disk accretion onto a neutron star possessing a weak surface magnetic field (B <= 108 G) provides interesting X-ray emission scenarios, and is relevant for understanding X-ray bursters and low--mass X-ray binaries. The standard (Newtonian) theory of disk--accretion predicts that the matter spiralling in from infinity loses one-half of its total gravitational energy in the extended disk, and the remainder in a narrow boundary layer girdling the neutron star. In the case of neutron stars, general relativity plays an important role; not only in determining their structure, but also in determining the space--time geometry around them. The structure of these objects depend, in addition to general relativity, also on the property of the ultra--high density matter constituting their interiors. Neutron stars that accrete matter from a companion over extended time scales (~ 108 yrs.), can get spun-up to very short periods (~ milliseconds). In this talk, we investigate how the incorporation of general relativity, rotation, and the relevant interior physics of neutron stars into the calculations, re-order (as compared to Newtonian calculations) the contributions to the gravitational energy release from the boundary layer, and the extended disk.

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