The rocket effect on a gravitating mass-losing object

Details The rocket effect on a gravitating mass-losing object The rocket effect on a gravitating mass-losing object

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..129i&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Nov. 1, 1986, p. 129-138.

Statistics

Computation

8

Accretion Disks, Gravitational Fields, Interstellar Gas, Stellar Mass Ejection, Computational Astrophysics, Hydrodynamics, Supersonic Flow

Scientific paper

Axisymmetric hydrodynamic calculations on an interaction between a gravitating object and ambient gas are performed. The authors have computed subsonic and supersonic flows past a mass-losing object in inviscid gas, and the drag coefficient is estimated. The drag coefficient Cd normalized by the accretion radius is found to obey the formula Cd = 2 log(rmax/rmin)+C, where rmax and rmin are the cut-off distances of gravity and C is constant, if the object is moving supersonically in the gas. If the velocity of the ejected wind is supersonic, the constant C is negative and one has a thrust rather than a drag supposing rmax not to be too large. If the object is moving subsonically, there is no logarithmic term and one has a genuine thrust, which may be called the rocket effect.

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