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Astron. Astrophys. 329, L29-L32 (1998)

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Formation of a gravitationally bound object
after binary neutron star merging and GRB phenomena

G.V. Lipunova 1 and V.M. Lipunov 2

1 Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, Moscow, 119899 Russia (e-mail: galja@sai.msu.su)
2 Sternberg Astronomical Institute, Moscow State University and Milano University (e-mail: lipunov@sai.msu.su)

Received 18 September 1997 / Accepted 9 October 1997

Abstract

The stages that follow the merging of two neutron stars are discussed. It is shown that if a rapidly rotating gravitationally bound object is formed after the merging (a spinar or a massive neutron star), then the characteristic time of its evolution is determined by a fundamental value

[EQUATION]

where the dimensionless value [FORMULA] depends on the exact equation of state of nuclear matter. The hypothesis is discussed as to whether the residual optical emission of the gamma-ray bursts is pulsar-like and its evolution driven by magnetodipole energy losses. It is shown that binary neutron star mergings can be accompanied by two gravitational wave burst separated either by the time of spinar's collapse [FORMULA] or neutron star cooling time ([FORMULA] 10 s), depending on the masses of neutron stars.

Key words: stars: neutron – - gamma rays: bursts

Send offprint requests to: G.V. Lipunova

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© European Southern Observatory (ESO) 1998

Online publication: December 8, 1997
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