Hydrodynamical Studies of Wind Accretion onto Compact Objects: Two‐dimensional Calculations | Zendy

J. S. Benensohn | Zendy; D. Q. Lamb | Zendy; Ronald E. Taam | Zendy

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Hydrodynamical Studies of Wind Accretion onto Compact Objects: Two‐dimensional Calculations

Author(s) -

J. S. Benensohn,

D. Q. Lamb,

Ronald E. Taam

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/303835

Subject(s) - physics , accretion (finance) , astrophysics , flow (mathematics) , accretion disc , rotation (mathematics) , transverse plane , compact star , pulsar , spin flip , flip flop , torque , mechanics , computational physics , geometry , neutron star , mathematics , structural engineering , engineering , cmos , optoelectronics , thermodynamics

We present the results of hydrodynamical simulations of nonaxisymmetric gasflow past a gravitating compact object in two dimensions. Calculations wereperformed with uniform flow as well as with transverse velocity and densitygradients. We find that the flow is highly nonsteady, exhibiting the``flip-flop'' behavior seen in previous studies in which accretion disks formwith alternating directions of rotation. We investigate the periodicity of theflip-flop behavior, and study the effects of spatial resolution on the results.We find that the flip-flop motion creates accretion torques which, in somecases, may be large enough to explain the erratic spin behavior observed insome massive X-ray pulsars.

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