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- Mass Transfer in High-mass X-Ray Binaries: from Roche Lobe Overflow to Hoyle–Lyttleton Accretion
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Mass Transfer in High-mass X-Ray Binaries: from Roche Lobe Overflow to Hoyle–Lyttleton Accretion
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We use a new overset dual spherical grid system to evolve the circumstellar gas flow in the High-Mass X-Ray Binary Vela X-1 to investigate the gravitational capture of the donor star’s wind and subsequent accretion onto the neutron star companion. For a fast, relatively undistorted stellar wind (small filling factor) we find results consistent with classical Hoyle–Lyttleton accretion with the formation of a steady, nearly axisymmetric bow shock. For models with a filling factor near unity, the mass transfer is dominated by a tidal stream feeding into a thin accretion disk. Finally, for slow winds without Roche Lobe Overflow we find the formation of a wind bow shock but with enough post shock angular momentum to form a thin, stable accretion disk.
This work is distributed under the Creative Commons CC BY 4.0 Licence.
Paper presented at the 41st Liège International Astrophysical Colloquium on “The eventful life of massive star multiples,” University of Liège (Belgium), 15–19 July 2024.
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About: John M. Blondin
email : john_blondin@ncsu.edu