Are strange stars distinguishable from neutron stars by their cooling behaviour?

Abstract

The general statement that strange stars cool more rapidly than neutron stars is investigated in greater detail. It is found that the direct Urca process could be forbidden not only in neutron stars but also in strange stars. If so, strange stars would be slowly cooling and their surface temperatures would be more or less indistinguishable from those of slowly cooling neutron stars. The case of enhanced cooling is reinvestigated as well. It is found that strange stars cool significantly more rapidly than neutron stars within the first $\sim 30$ years after birth. This feature could become particularly interesting if continued observation of SN 1987A would reveal the temperature of the possibly existing pulsar at its centre.

arXiv comment10 pages, 3 ps-figures, to appear in the proceedings of the International Symposium on ''Strangeness in Quark Matter 1997``, April 14--18, Thera (Santorini), Hellas

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• R-mode instability of strange stars and observations of neutron stars in LMXBs
• Strange stars with a mirror-dark-matter core confronting with the observations of compact stars
• Could strange stars be in the color-flavor-locked phase: Tested by their thermal evolutions
• Lepton-rich cold QCD matter in protoneutron stars
• Interacting quark matter effects on the structure of compact stars