Strange stars and their cooling at positron electroneutralization of quark matter.

Details Strange stars and their cooling at positron electroneutralization of quark matter. Strange stars and their cooling at positron electroneutralization of quark matter.

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999afz....42..617h&link_type=abstract

Astrofizika, Tom 42, Vyp. 4, p. 617 - 630

Astronomy and Astrophysics

Astronomy

Strange Matter: Cooling, Strange Matter: Quark Matter

Scientific paper

The questions of balance, stability and observable displays of strange stars are examined. In these stars the electroneutralization of quark matter is provided by positrons, which is realized for some sets of bag parameters resulting in more stiff equation of state. Such models entirely consist of self-bound strange quark matter and their maximal mass reaches the values of 2.4 - 2.5 Msun at radius of 13 - 14 km. The cooling of such strange quark stars is investigated both in absence and in presence of accretion of matter. It is shown that in absence of accretion of matter on a strange star, the dependence temperature (T, K)-age (t, years) very insignificantly depends on the mass of configurations and has the following form T ≍ 2.3×108t-1/5. If the initial temperature of the star is very high (T0 ≥ 2×1010), the complete number of emitted electron-positron pairs does not depend on it, and is determined by the mass of the configuration. In case of accretion due to annihilation of electrons of falling matter with positrons of strange quark matter, the γ-quantums with energy ≡0.5 MeV are emitted. Observing them the candidates for strange stars can be selected. The maximal possible temperature of strange stars is computed at accretion of matter.

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