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Disk Structure and Evolution Around the Neutron Star in Be/X-Ray Binaries

Published online by Cambridge University Press:  22 February 2018

Kimitake Hayasaki  and
Atsuo T. Okazaki
Kimitake Hayasaki
Affiliation:
Division of Physics, Graduate School of Science, Hokkaido University, Kitaku N10WS, Sapporo 060-0810, Japan (kimi@astrol.sci.hokudai.ac.jp)
Atsuo T. Okazaki
Affiliation:
Faculty of Engineering, Hokkai-Gakuen University, Toyohira-ku, Sapporo 062-8605, Japan

Extract

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We investigate the accretion flow around the neutron star in Be/X-ray binaries, using a 3D SPH code and the data imported from simulations by Okazaki et al. (2002) and Okazaki & Hayasaki (2004) for both a coplanar system and a misaligned system in which the Bo-star disk is inclined from the binary orbital plane by 30 degrees, with a short period (Porb = 24.3 days) and moderate eccentricity (e = 0.34). We find that a non-steady accretion disk is formed around the neutron star in the misaligned case as well as in the coplanar case. The disk size in the misaligned system is significantly larger because of its higher angular momentum than that in the coplanar system. We also find that the disk also evolves via a two-stage process, which consists of the initial developing stage and the latar developed stage.

Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 230
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

References

Bate, M. R.. Bonnell, I. A., Price, N. M. 1995, MNRAS, 285, 33 Google Scholar
Hayasaki, K & Okazaki, A. T. 2003, submitted to MNRASGoogle Scholar
Okazaki, A. Т., Bate, M. R., Ogilvie, G. L., & Pringle, J. E. 2002. MNRAS, 337, 967 Google Scholar
Okazaki, A. Т., & Hayasaki, K. 2004, these proceedingsGoogle Scholar