Quadrupole moments of rotating neutron stars

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.