EDP Sciences
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Volume 371, Number 3, June I 2001
Page(s) 963 - 972
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010450

A&A 371, 963-972 (2001)
DOI: 10.1051/0004-6361:20010450

The birth of strange stars and their dynamo-originated magnetic fields

R. X. Xu1, 2 and F. H. Busse2

1  Beijing Astrophysical Center and Astronomy Department, Peking University, Beijing 100871, PR China
2  Theoretical Physics IV, University of Bayreuth, 95440 Bayreuth, Germany
    e-mail: Friedrich.Busse@uni-bayreuth.de

(Received 5 October 2000 / Accepted 12 March 2001 )

It is shown that protostrange stars (PSSs) can be convective and that there are two possible scenarios describing their turbulence. Besides the local turbulence on the scale which is less than the mean free path of neutrinos, large-scale (~1 km) convection also may occur with properties that are similar to those of convection in protoneutron stars (PNSs). We thus suggest that strange stars can also create dynamo-originated magnetic fields during the deleptonization episode soon after a supernova explosion. Further detailed investigations are needed to see whether or not strange stars and neutron stars can be distinguished according to the differences in dynamo actions in strange quark matter and in neutron matter. The magnetic fields of strange stars and neutron stars may also behave very differently during the accretion-phase when the fields decay.

Key words: stars: pulsars: general -- stars: neutron -- elementary particles -- stars: supernovae: general -- magnetic fields

Offprint request: R. X. Xu, rxxu@bac.pku.edu.cn

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