The collimation of a time-dependent stellar wind

Details The collimation of a time-dependent stellar wind The collimation of a time-dependent stellar wind

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..689k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Oct. 1, 1991, p. 689-695. Research supported by NSERC.

Statistics

Computation

5

Collimation, Early Stars, Jet Flow, Stellar Winds, Time Dependence, Computational Astrophysics, Convergent-Divergent Nozzles, Molecular Flow, Nozzle Flow

Scientific paper

The problem of the collimation of a time-dependent stellar wind by nonadiabatic de Laval nozzle flows is studied. It is found that both velocity and density variations of the wind from the source can cause large velocity variations in the jet that is produced by the nozzle flow. The largest velocity variations in the jet flow are obtained when the wind is collimated through a highly nonadiabatic nozzle. It is also found that short-period time-variations of the source are 'filtered out' by the nozzle flow, so that they do not produce corresponding time variations in the stellar jet. This result might provide a natural explanation for the separation between knots of stellar jets, which also shows associated time scales of the order of 30-100 yr.

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