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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2007

Rotation at 1122 Hz and the neutron star structure

Résumé

Aims:Recent observations of XTE J1739-285 suggest that it contains a neutron star rotating at 1122 Hz. Such rotation imposes bounds on the structure of neutron star in XTE J1739-285. These bounds may be used to constrain poorly known equation of state of dense matter at densities ⪆ 1015~g~cm-3.
Methods: One-parameter families of stationary configurations rotating rigidly at 1122 Hz are constructed, using a precise 2D code solving Einstein equations. Hydrostatic equilibrium solutions are tested for stability with respect to axi-symmetric perturbations. A set of ten diverse EOSs of neutron stars is considered. Hypothetical strange stars are also studied.
Results: For each EOS, the family of possible neutron star models is limited by the mass shedding limit, corresponding to maximum allowed equatorial radius, R_max, and by the instability with respect to the axi-symmetric perturbations, reached at the minimum allowed equatorial radius, R_min. We get R_min~= 10-13 km, and R_max~= 16-18 km, with allowed mass 1.4-2.3~M_&sun;. Allowed stars with hyperonic or exotic-phase core are supramassive and have a very narrow mass range. Quark star with accreted crust might be allowed, provided such a model is able to reproduce X-ray bursts from XTE J1739-285.

Dates et versions

hal-03732977 , version 1 (21-07-2022)

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Michal Bejger, Pawel Haensel, J. L. Zdunik. Rotation at 1122 Hz and the neutron star structure. Astronomy and Astrophysics - A&A, 2007, 464, pp.L49-L52. ⟨10.1051/0004-6361:20066902⟩. ⟨hal-03732977⟩
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