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Published November 1, 2013 | Published + Submitted
Journal Article Open

Relations between Neutron-star Parameters in the Hartle-Thorne Approximation

Abstract

Using stellar structure calculations in the Hartle-Thorne approximation, we derive analytic expressions connecting the ellipticity of the stellar surface to the compactness, the spin angular momentum, and the quadrupole moment of the spacetime. We also obtain empirical relations between the compactness, the spin angular momentum, and the spacetime quadrupole. Our formulae reproduce the results of numerical calculations to within a few percent and help reduce the number of parameters necessary to model the observational appearance of moderately spinning neutron stars. This is sufficient for comparing theoretical spectroscopic and timing models to observations that aim to measure the masses and radii of neutron stars and to determine the equation of state prevailing in their interiors.

Additional Information

© 2013 Received 2013 May 31; accepted 2013 September 1; published 2013 October 17. The work at the University of Arizona was supported in part by NSF grant AST-1108753, NSF CAREER award AST-0746549, and Chandra Theory grant TM2-13002X. E.B.'s research is supported by NSF CAREER grant No. PHY-1055103. F.Ö. gratefully acknowledges support from the Radcliffe Institute for Advanced Study at Harvard University.

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Published - 0004-637X_777_1_68.pdf

Submitted - 1306.0569v2.pdf

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August 22, 2023
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