Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 395, Issue 4, Pages 2257-2267Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.14693.x
Keywords
dense matter; neutrinos; stars: magnetic fields; stars: neutron
Categories
Funding
- Russian Foundation for Basic Research [08-02-00837]
- State Program 'Leading Scientific Schools of Russian Federation' [NSh 2600.2008.2]
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We study the thermal structure and evolution of magnetars as cooling neutron stars with a phenomenological heat source in an internal layer. We focus on the effect of magnetized (B >= 10(14) G) non-accreted and accreted outermost envelopes composed of different elements, from iron to hydrogen or helium. We discuss a combined effect of thermal conduction and neutrino emission in the outer neutron star crust and calculate the cooling of magnetars with a dipole magnetic field for various locations of the heat layer, heat rates and magnetic field strengths. Combined effects of strong magnetic fields and light-element composition simplify the interpretation of magnetars in our model: these effects allow one to interpret observations assuming less extreme (therefore, more realistic) heating. Massive magnetars, with fast neutrino cooling in their cores, can have higher thermal surface luminosity.
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