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Mass-Capture Rate by the Neutron Star in Be/X-Ray Binaries

Published online by Cambridge University Press:  22 February 2018

A. T. Okazaki  and
K. Hayasaki
A. T. Okazaki
Affiliation:
Faculty of Engineering, Hokkai-Gakuen University, Japan
K. Hayasaki
Affiliation:
Department of Physics, Hokkaido University, Japan

Abstract

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We study the interaction between the Be-star disk and the neutron star in Be/X-ray binaries by three dimensional SPH simulations. We find that, the resonant, truncation of the Be disk works except for systems with extremely high orbital eccentricity or large misalignment angles between the Be disk and the orbital plane. Owing to the truncation, the mass-capture rate by the neutron star is sensitive both to the orbital eccentricity and to the angle of misalignment. It is single-peaked in coplanar systems and in systems with small misalignment angles, whereas it, becomes double-peaked in systems with large misalignment angles.

Resumen

Resumen

Estudiamos la interacción entre el disco dc estrellas Be y la estrella de neutrones en binarias Be/rayos X mediante simulaciones en tres dimensiones SPH. Encontramos que el truncamiento resonante del disco de la estrella Be opera, bien excepto para, sistemas con excentricidad orbital extremadamente alta о grandes ángulos de desalineación entre el disco Be v el plano orbital. Debido al truncamiento, la tasa de captura de masa por la estrella de neutrones es sensible tantо a la excentricidad orbital como al ángulo de desalineación. Posee un solo Pico en sistemas coplanares y en sistemas con ángulos de desalineación pequeños, mientras que llega a tener dos pirns en sistemas con grandes ángulos de desalineación.

Keywords

AccretionAccretion Disks — BinariesClose — Hydrodynamics — StarsEmission-Line, BE — X-RaysStars
Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 144 - 145
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

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