Disk luminosity and angular momentum for accreting,weak field neutron stars in the ‘Slow’ rotation approximation |
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| Authors: | Bhaskar Datta Arun V Thampan Paul J Wiita |
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| Institution: | (1) Raman Research Institute, 560 080 Bangalore, India;(2) Present address: Department of Physics & Astronomy, Georgia State University, 30303-3083 Atlanta, GA, USA;(3) Indian institute of Astrophysics, 560034 Bangalore, India |
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| Abstract: | For accretion on to neutron stars possessing weak surface magnetic fields and substantial rotation rates (corresponding to
the secular instability limit), we calculate the disk and surface layer luminosities general relativistically using the Hartle
& Thorne formalism, and illustrate these quantities for a set of representative neutron star equations of state. We also discuss
the related problem of the angular momentum evolution of such neutron stars and give a quantitative estimate for this accretion
driven change in angular momentum. Rotation always increases the disk luminosity and reduces the rate of angular momentum
evolution. These effects have relevance for observations of low-mass X-ray binaries. |
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| Keywords: | Stars: accretion stars: accretion disks stars: neutron stars: rotation |
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