A Modified Beat Frequency Modulated Accretion Model I. Spin Periods and Magnetic Moments of Z-Sources Inferred from Horizontal Branch QPO.

Abstract

We present a modified beat-frequency modulated accretion model appropriate to a description of the horizontal branch oscillations of Z-type low-mass x-ray binaries. This model incorporates several new physical elements: (1) magnetic screening by the accretion disk and neutron star, (2) radiation pressure dominance in the inner disk, and (3) stellar rotation effects. Fitted to observational data, the model constrains the surface magnetic field in a typical LMXB Z source to be less than 10(exp 9) G and the stellar spin frequency to be greater than 400 Hz. The predicted high stellar spin frequency falls in a range where observational upper limits on pulsation are not a constraint. The derived magnetic field and spin frequency range are compatible with the fastest radio pulsars.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1996
Accession Number
ADA327573

Entities

People

  • Kent S. Wood
  • Mallory S. Roberts
  • Peter F. Michelson

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplitude Modulation
  • Angular Momentum
  • Boundary Layer
  • Dipole Moments
  • Equations
  • Frequency
  • Magnetic Dipoles
  • Magnetic Fields
  • Magnetic Moments
  • Mass Flow
  • Modulation
  • Momentum
  • Neutron Stars
  • Radiation
  • Radiation Pressure
  • Scattering
  • X Rays

Fields of Study

  • Physics

Readers

  • Astronomy/Astrophysics
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference