Relations between neutron-star parameters in the Hartle-Thorne approximation

Michi Bauböck, Emanuele Berti, Dimitrios Psaltis, Feryal Özel

Research output: Contribution to journalArticle

53 Scopus citations

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.

Original languageEnglish (US)
Article number68
JournalAstrophysical Journal
Volume777
Issue number1
DOIs
StatePublished - Nov 1 2013

Keywords

  • gravitation
  • relativistic processes
  • stars: neutron

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Relations between neutron-star parameters in the Hartle-Thorne approximation'. Together they form a unique fingerprint.

  • Cite this