Journal Article

Long-term evolution of dim isolated neutron stars

Ü. Ertan, Ş. Çalışkan, O. Benli and M. A. Alpar

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 444, issue 2, pages 1559-1565
ISSN: 0035-8711
Published online August 2014 | e-ISSN: 1365-2966 | DOI:
Long-term evolution of dim isolated neutron stars

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The X-ray dim isolated neutron stars (XDINs) have periods in the same range as the anomalous X-ray pulsars (AXPs) and the soft gamma-ray repeaters (SGRs). We apply the fallback disc model, which explains the period clustering and other properties of AXP/SGRs, to the six XDINs with measured periods and period derivatives. Present properties of XDINs are obtained in evolutionary scenarios with surface dipole magnetic fields B0 ∼ 1012 G. The XDINs have gone through an accretion epoch with rapid spin-down earlier, and have emerged in their current state, with the X-ray luminosity provided by neutron star cooling and no longer by accretion. Our results indicate that the known XDINs are not likely to be active radio pulsars, as the low B0, together with their long periods place these sources clearly below the ‘death valley’.

Keywords: accretion, accretion discs; stars: neutron; pulsars: individual (AXPs); X-rays: bursts

Journal Article.  5880 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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