Astrophysics by G. Borner, J. Stewart

By G. Borner, J. Stewart

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But if one believes that the equation of state behaves asymptotically as predicted by the bootstrap concept, then one could follow Leung and Wang (1971) and apply this concept in the whole region where hyperons are present. The equation of state at lower densities then becomes just the equation of state of a mixture of different noninteracting Fermi gases, until it is joined smoothly at about 5 x 1014 g/cm 3 to the equation of state derived from nuclear many-body theory. In Fig. 2) might not show up till still higher densities have been reached), where in both cases the bootstrap concept is employed.

This particle acceleration mechanism therefore seems to be unrealistic. If the distance to the Crab were less or more than 2 kpc, the limits derived above would have to be scaled down or up accordingly. 4 M o, respectively (BBS)]. 4. 1 x 104 years old, has a radius of 10 pc, and is at a distance of 500 pc (Milne, 1970). If the electromagnetic radiation emitted by Vela X is synchrotron, then from synchrotron theory the energy content in the gas can be estimated at ~ 1049 (Tucker, 1971). 4 x 103v erg/sec.

The fate of neutron stars in binary systems has been discussed repeatedly, especially since the discovery of periodically pulsating X-ray sources (cf. 6). Shvartsman (1971) has pointed out that the stellar wind from the companion star in a binary system can very effectively suppress the ejection of particles from the neutron star, and thus "'neutron stars in binary systems should not be pulsars". Pringle and Rees (1972) consider the accretion process (in a binary system) in cases when the infalling matter possesses angular momentum and forms a disc spinning On the Properties of Matter in Neutron Stars 49 around the neutron star.

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