On the minimum period of uniformly rotating neutron stars

Citation
P. Haensel et al., On the minimum period of uniformly rotating neutron stars, ASTRON ASTR, 344(1), 1999, pp. 151-153
Citations number
13
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
00046361 → ACNP
Volume
344
Issue
1
Year of publication
1999
Pages
151 - 153
Database
ISI
SICI code
0004-6361(199904)344:1<151:OTMPOU>2.0.ZU;2-Z
Abstract
We show that the neutron star minimum period of uniform rotation is determi ned, for causal equations of state, by the maximum value of the relativisti c (compactness) parameter 2GM/Rc(2), allowed by causality for static neutro n stars, 0.7081, and by the largest measured mass of a neutron star. The re lation between these three quantities, resulting from the extrapolation of the empirical formulae of Lasota et al. (1996), yields the minimum period o f 0.288 ms, only 2% higher than an absolute lower bound obtained in extensi ve exact numerical calculations of Koranda et al. (1997).