Computer Science – Sound
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990acaps..10..374y&link_type=abstract
Acta Astrophys. Sin., Vol. 10, No. 4, p. 374 - 378
Computer Science
Sound
Star Formation: Bipolar Outflows, Pre-Main-Sequence Stars: Jets, Pre-Main-Sequence Stars: Stellar Winds
Scientific paper
It is shown that a field strength of ≡1.6 milligauss at the inner part of the toroid around a young stellar object is enough to hold the lateral expansion of the stellar wind of M˙w ≡ 4·10-9Msunyr-1 and Vw ≡ 300 km s-1 at a distance smaller than 3·1015cm, as required by observations. Thus, the wind material has to turn its way to the vertical directions through a "magnetic de Laval nozzle". The thermal pressure of the jet is balanced by the external magnetic pressure of the longitudinal field. The Kelvin-Helmholtz instability of such an equilibrium state is investigated. A simple analytical method is developed for the resonant modes. The properly scaled growth rates, wave numbers, and phase speeds of the first ten resonant modes are plotted against a single parameter, the ratio between the external Alfvén speed and the internal sound speed. Many observational features, such as the space between the knots, the high proper motions, and the optical invisibility of the expansion part of the jet, can all be explained by this model.
Winnewisser Gisbert
Yue Zeng-Huan
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