Authors

Citation

Wg. Laarakkers et E. Poisson, Quadrupole moments of rotating neutron stars, ASTROPHYS J, 512(1), 1999, pp. 282-287

Citations number

22

Language

INGLESE

art.tipo

Article

Categorie Soggetti

Space Sciences

Journal title

ASTROPHYSICAL JOURNAL

ISSN journal

0004-637X
→ ACNP

Volume

512

Issue

1

Year of publication

1999

Part

1

Pages

282 - 287

Database

ISI

SICI code

0004-637X(19990210)512:1<282:QMORNS>2.0.ZU;2-R

Abstract

Numerical models of rotating neutron stars are constructed for four equatio
ns of state using the computer code RNS written by Stergioulas. For five se
lected values of the star's gravitational mass (in the interval between 1.0
and 1.8 solar masses) and for each equation of state, the star's angular m
omentum is varied from J = 0 to the Keplerian limit J = J(max). For each ne
utron star configuration, we compute Q, the quadrupole moment of the mass d
istribution. We show that for given values of M and J, \ Q \ increases with
the stiffness of the equation of state. For fixed mass and equation of sta
te, the dependence on J is well reproduced with a simple quadratic fit, Q s
imilar or equal to - aJ(2)/Mc(2), where c is the speed of light and a is a
parameter of order unity depending on the mass and the equation of state.