Accretion onto the neutron star in Be/X-ray binaries

Details Accretion onto the neutron star in Be/X-ray binaries Accretion onto the neutron star in Be/X-ray binaries

2003-10-15

arxiv.org/abs/astro-ph/0310403v1

Astronomy and Astrophysics

Astrophysics

2 pages, 8 figures, To appear in "Young Neutron Stars and Their Environments" (IAU Symposium 218, ASP Conference Proceedings),

Scientific paper

We study accretion onto the neutron star in Be/X-ray binaries, using a 3D SPH code and the data imported from a high resolution simulation by Okazaki et al.\ (2002) for a coplanar system with a short period ($P_{\rm orb}=24.3 \rm d$) and moderate eccentricity $(\rm{e=0.34})$. We find that a time-dependent accretion disk is formed around the neutron star in Be/X-ray binaries. The disk shrinks after the periastron passage of the Be star and restores its radius afterwards. Our simulations show that the truncated Be disk model for Be/X-ray binaries is consistent with the observed X-ray behavior.

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