Testing consistency of deconfinement heating of strange stars in superbursters and soft X-ray transients
نویسنده
چکیده
Both superbursters and soft X-ray transients probe the thermal structure of the crust on compact stars and are sensitive to the process of deep crustal heating. It was recently shown that the transfer of matter from crust to core in a strange star can heat the crust by deconfinement and ignite superbursts provided certain constraints on the strange quark matter equation of state are fulfilled. Corresponding constraints are derived for soft Xray transients in a simple parameterized model assuming their quiescent emission is powered in the same way, and the time dependence of this heating mechanism in transient systems is discussed.
منابع مشابه
Consistency between deep crustal heating of strange stars in superbursters and soft X-ray transients
Context. Both superbursters and soft X-ray transients probe the process of deep crustal heating in compact stars. It was recently shown that the transfer of matter from crust to core in a strange star can heat the crust and ignite superbursts provided certain constraints on the strange quark matter equation of state are fulfilled. Aims. We derive corresponding constraints on the equation of sta...
متن کاملForty Years of X-Ray Binaries
In 2012 it was forty years ago that the discovery of the first X-ray binary Centaurus X-3 became known. That same year it was discovered that apart from the High-Mass X-ray Binaries (HMXBs) there are also Low-Mass X-ray Binaries (LMXBs), and that Cygnus X-1 is most probably a black hole. By 1975 also the new class of Be/X-ray binaries was discovered. After this it took 28 years before ESAs INTE...
متن کاملThermal states of coldest and hottest neutron stars in soft X-ray transients
We calculate the thermal structure and quiescent thermal luminosity of accreting neutron stars (warmed by deep crustal heating in accreted matter) in soft X-ray transients (SXTs). We consider neutron stars with nucleon and hyperon cores and with accreted envelopes. It is assumed that an envelope has an outer helium layer (of variable depth) and deeper layers of heavier elements, either with iro...
متن کاملThe Evolution of the High Energy Tail in the Quiescent Spectrum of the Soft
A moderate level of variability has been detected in the quiescent luminosity of several neutron star soft X– ray transients. Spectral variability was first revealed by Chandra observations of Aql X-1 in the four months that followed the 2000 X–ray outburst. By adopting the canonical model for quiescent spectrum of soft X–ray transients, i.e. an absorbed neutron star atmosphere model plus a pow...
متن کاملNeutron star cooling: theoretical aspects and observational constraints
The cooling theory of isolated neutron stars is reviewed. The main cooling regulators are discussed, first of all, operation of direct Urca process (or similar processes in exotic phases of dense matter) and superfluidity in stellar interiors. The prospects to constrain gross parameters of supranuclear matter in neutron star interiors by confronting cooling theory with observations of isolated ...
متن کامل