Maximum redshift and minimum rotation period of neutron stars

Details Maximum redshift and minimum rotation period of neutron stars Maximum redshift and minimum rotation period of neutron stars

1999-05-05

arxiv.org/abs/astro-ph/9905036v1

Astronomy and Astrophysics

Astrophysics

5 pages, latex, uses texas.sty. Presented at the 19th Texas Symposium, 14-19 December 1998, Paris, France. To appear in the 19

Scientific paper

The lower bound on the period of uniform rotation of neutron stars (NS) with causal equation of state (EOS), P_ min, is shown to be determined, with a high precision, by the upper bound on the surface redshift of static neutron star models, z_ max. We obtain z_max=0.851, which turns out to be about 5% lower than upper bound obtained by Lindblom (1984). Using then the empirical formula for the maximum rotation frequency of uniform rotation of neutron star models with realistic causal EOS, derived by Lasota et al. (1996), we establish an approximate relation between z_max and P_min, in which P_min is proportional to the maximum mass of static NS, M_s^ max. In this way we reproduce, within 2%, the exact formula of Koranda et al. (1997) based on extensive exact numerical calculations. Replacing M_s^max by the maximum measured NS mass, 1.442 M_sun, we get a lower bound P_min = 0.288 ms.

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