EDP Sciences
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Volume 434, Number 2, May I 2005
Page(s) 649 - 655
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20042150

A&A 434, 649-655 (2005)
DOI: 10.1051/0004-6361:20042150

Formation of massive skyrmion stars

S. B. Popov1, 2 and M. E. Prokhorov1

1  Sternberg Astronomical Institute, Universitetski pr. 13, 119992 Moscow, Russia
    e-mail: [polar,mike]@sai.msu.ru
2  Università di Padova, Dipartimento di Fisica, via Marzolo 8, 35131 Padova, Italy
    e-mail: popov@pd.infn.it

(Received 10 October 2004 / Accepted 16 December 2004 )

We discuss different channels of formation of massive rapidly rotating neutron stars. We use a population synthesis code to estimate numbers of massive neutron stars in different evolutionary stages. For stiff equations of state the existence of neutron stars with masses $\ga 2\, M_{\odot}$ is possible. An especially interesting situation occurs if the equation of state based on the Skyrme theory is realized in nature. A neutron star increases its mass by accretion from a secondary companion. Significant growth of a neutron star mass due to accretion is possible only for certain values of initial parameters of the binary. In this paper we show that a significant part of massive neutron stars with $M\ga 2\, M_{\odot}$ can be observed as millisecond radio pulsars, as X-ray sources in pairs with white dwarfs, and as accreting neutron stars with very low magnetic fields.

Key words: stars: neutron -- stars: evolution -- stars: statistics -- X-rays: binaries -- binaries: close -- pulsars: general

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