Mathematics – Logic
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..227u&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 44, no. 3, 1992, p. 227-243. Research supported by Japan Soci
Mathematics
Logic
14
Astronomical Models, Herbig-Haro Objects, Interstellar Magnetic Fields, Magnetohydrodynamic Flow, Plasma Jets, Star Formation, Computerized Simulation, Shock Waves
Scientific paper
An MHD model for Herbig-Haro (HH) objects in which a large-scale interstellar magnetic field plays a basic role is presented. The model contains two essential, distinct elements. First, it is assumed that the large-scale interstellar magnetic field is spatially constricted during the contraction phase of star formation, and becomes helical due to production of a toroidal field component by the rotation of the central star + disk system. Second, it is assumed that this large-scale field acts as a guide field for the high-velocity flows associated with the optical jets emanating from the star forming at the center. In that case, it is shown that the impinging optical jet accompanies four distinct shock fronts, namely, MHD fast and slow shocks ahead, and reverse fast and slow shocks propagating backward into the moving jet medium behind the contact discontinuity. The result of this simplified 1.5-D MHD simulations strongly indicate that this 'magnetically-guided stream' picture can account for the high Doppler and proper-motion velocities of the HH objects, which are generally different from each other. Results suggest that the more complex morphological characteristics of these objects such as the 'jet with bright-spot + bow shock' type structures (e.g., HH34) and those with 'wiggled filamentary structures' (e.g., HH46/47) of some HH objects could be explained by MHD models in 2.5D or 3D.
Rosner Robert
Shibata Kazunari
Todo Yasushi
Uchida Yutaka
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