Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-18
Mon.Not.Roy.Astron.Soc.343:L69,2003
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures, Accepted in MNRAS, includes minor corrections
Scientific paper
10.1046/j.1365-8711.2003.06921.x
We present the results of numerical simulations of stationary, spherically outflowing, pair winds, with total luminosities of L=10^{35}- 10^{42} ergs/s. These results have direct relevance to the emission from hot, bare, strange stars, which are thought to be powerful sources of electron-positron pairs created by the Coulomb barrier at the quark surface. The spectra of emergent photons and pairs are calculated. For L > 2x10^{35} erg/s, photons dominate the emerging emission. As L increases from 10^{35} to 10^{42} ergs/s, the mean photon energy decreases from ~ 400-500 keV to 40 keV, while the spectrum changes in shape from a wide annihilation line to being nearly blackbody with a high energy (> 100 keV) tail. Such a correlation of the photon spectrum with the luminosity, together with the fact that super-Eddington luminosities can be achieved, might be a good observational signature of hot, bare, strange stars.
Aksenov Alexey G.
Milgrom Mordehai
Usov Vladimir V.
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