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Astron. Astrophys. 334, 943-952 (1998)

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Equilibrium sequences of rotating neutron stars for new realistic Equations of State

B. Datta * 1, A.V. Thampan 1 and I. Bombaci 2

1 Indian Institute of Astrophysics, Bangalore 560 034,India
2 Dipartimento di Fisica, Universitá di Pisa, and INFN Sezione di Pisa, Piazza Torricelli 2, I-56100 Pisa, Italy

Received 8 January 1998 / Accepted 3 March 1998


For four newly suggested realistic Equations of State of neutron star matter, we construct equilibrium sequences of rapidly rotating neutron stars in general relativity. The sequences are the normal and supramassive evolutionary sequences of constant rest mass. We find that for these equations of state the maximum (gravitational) mass rotating models occur (in central density and rotation rate [FORMULA]) before the maximum- [FORMULA] models. We calculate equilibrium sequences for a constant value of [FORMULA] corresponding to the most rapidly rotating pulsar PSR 1937+21. Also calculated is the radius of the marginally stable orbit and its dependence on [FORMULA], relevant for modeling of kilo-Hertz quasi-periodic oscillations in X-ray binaries.

Key words: Equation of State – pulsars: general – relativity – stars:neutron – stars: rotation

* Also at Raman Research Institute, Bangalore 560 080, INDIA

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© European Southern Observatory (ESO) 1998

Online publication: June 2, 1998