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Aperiodic Flux Variability in A 0535+262

Published online by Cambridge University Press:  25 May 2016

Mark H. Finger ,
Robert B. Wilson ,
B. Alan Harmon  and
William S. Paciesas
Mark H. Finger
Affiliation:
Compton Observatory Science Support Center/USRA, Goddard Space Flight Center
Robert B. Wilson
Affiliation:
NASA/Marshall Space Flight Center
B. Alan Harmon
Affiliation:
NASA/Marshall Space Flight Center
William S. Paciesas
Affiliation:
University of Alabama Huntsville

Abstract

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A “giant” outburst of A 0535+262, a transient X-ray binary pulsar, was observed in 1994 February and March with the Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma-Ray Observatory. During the outburst power spectra of the hard X-ray flux contained a QPO-like component with a FWHM of approximately 50% of its center frequency. Over the course of the outburst the center frequency rose smoothly from 35 mHz to 70 mHz and then fell to below 40 mHz. We compare this QPO frequency with the neutron star spin-up rate, and discuss the observed correlation in terms of the beat frequency and Keplerian frequency QPO models in conjunction with the Ghosh-Lamb accretion torque model.

Type
5 X-ray Binaries
Information
Symposium - International Astronomical Union , Volume 165: Compact Stars in Binaries , 1996 , pp. 313 - 319
Copyright
Copyright © Kluwer 1996 

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