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Title:
On the power spectra of the wind-fed X-ray binary pulsar GX 301 - 2
Authors:
Orlandini, Mauro; Morfill, G. E.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD; SISSA, Trieste, Italy), AB(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 20, 1992, p. 703-709. Research supported by MURST. (ApJ Homepage)
Publication Date:
02/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Accretion Disks, Neutron Stars, Pulsars, Stellar Mass Accretion, Stellar Winds, X Ray Binaries, Phenomenology, Power Spectra, Statistical Analysis, Stellar Physics, Stellar Spectra
DOI:
10.1086/171050
Bibliographic Code:
1992ApJ...386..703O

Abstract

A phenomenological model of accretion which is applied to the wind-fed X-ray binary pulsar GX 301 - 2 is developed, assuming that the accretion onto the neutron star does not occur from a continuous flux of plasma, but from blobs of matter which are threaded by the magnetic field lines onto the magnetic polar caps of the neutron star. These 'lumps' are produced at the magnetospheric limit by magnetohydrodynamical instability, introducing a 'noise' in the accretion process, due to the discontinuity in the flux of matter onto the neutron star. This model is able to describe the change of slope observed in the continuum component of the power spectra of the X-ray binary pulsar GX 301 - 2, in the frequency range 0.01 - 0.1 Hz. The physical properties of the infalling blobs derived in the model are in agreement with the constraints imposed by observations.

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