Hard apex transition in quasi-periodic oscillators - Closing of the accretion gap

Details Hard apex transition in quasi-periodic oscillators - Closing of the accretion gap Hard apex transition in quasi-periodic oscillators - Closing of the accretion gap

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..302b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 302-312.

Astronomy and Astrophysics

Astrophysics

10

Accretion Disks, Apexes, Color-Color Diagram, Stellar Mass Accretion, Stellar Oscillations, X Ray Binaries, Boundary Layers, Equations Of State, Gas Flow, Neutron Stars, Periodic Variations, Stellar Magnetospheres

Scientific paper

We propose that the 'hard apex' transition in the X-ray two-color diagrams for low-mass X-ray binaries exhibiting quasi-periodic oscillation is associated with closure of a gap between the accretion disk and the star. At low accretion rates, gas crosses this gap intermittently. However, when the mass accretion rate increases, the disk thickens and its inner edge touches the star, thus forming a boundary layer through which the gas flows steadily. This explanation is viable provided that the equation of state of nuclear matter is not significantly harder than the Bethe-Johnson I prescription. Accretion gap scenarios are possibly distinguishable from models which invoke a small magnetosphere around the neutron star, in that they preclude large stellar magnetic fields and associate the high-frequency (horizontal-branch) oscillations with different sites.

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