A Review of Bondi–Hoyle–Lyttleton Accretion

نویسنده

  • Richard Edgar
چکیده

If a point mass moves through a uniform gas cloud, at what rate does it accrete material? This is the question studied by Bondi, Hoyle and Lyttleton. This paper draws together the work performed in this area since the problem was first studied. Time has shown that, despite the simplifications made, Bondi, Hoyle and Lyttleton made quite accurate predictions for the accretion rate. Bondi–Hoyle–Lyttleton accretion has found application in many fields of astronomy, and these are also discussed.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

High Mach-number Bondi–Hoyle–Lyttleton flow around a small accretor

In this paper, we discuss a two-dimensional numerical study of isothermal high Mach number Bondi– Hoyle–Lyttleton flow around a small accretor. The flow is found to be unstable at high Mach numbers, with the instability appearing even for a larger accretor. The instability appears to be the unstable radial mode of the accretion column predicted by earlier analytic work.

متن کامل

A fresh look at the unstable simulations of Bondi - Hoyle - Lyttleton accretion

The instability of Bondi-Hoyle-Lyttleton accretion, observed in numerical simulations, is analyzed through known physical mechanisms and possible numerical artefacts. The mechanisms of the longitudinal and transverse instabilities, established within the accretion line model, are clarified. They cannot account for the instability of BHL accretion at moderate Mach number when the pressure forces...

متن کامل

An analytic study of Bondi–Hoyle–Lyttleton accretion II. Local stability analysis

The adiabatic shock produced by a compact object moving supersonically relative to a gas with uniform entropy and no vorticity is a source of entropy gradients and vorticity. We investigate these analytically. The non–axisymmetric Rayleigh– Taylor and axisymmetric Kelvin–Helmholtz linear instabilities are potential sources of destabilization of the subsonic accretion flow after the shock. A loc...

متن کامل

ASTRONOMY AND ASTROPHYSICS An analytic study of Bondi–Hoyle–Lyttleton accretion II. Local stability analysis

The adiabatic shock produced by a compact object moving supersonically relative to a gas with uniform entropy and no vorticity is a source of entropy gradients and vorticity. We investigate these analytically. The non–axisymmetric Rayleigh–Taylor and axisymmetric Kelvin–Helmholtz linear instabilities are potential sources of destabilization of the subsonic accretion flow after the shock. A loca...

متن کامل

An analytic study of Bondi – Hoyle – Lyttleton accretion

We prove that the sonic surface of axi-symmetric meridional stationary flows is always attached to the accretor, however small, if the adiabatic index of the gas is γ = 5/3. Using local expansions near a point-like accretor, we extend Bondi's classification of spherically symmetric flows to axisymmetric flows, introducing the possibility of angular sectors reached by no flow lines, and singular...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2004