Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419..255o&link_type=abstract
Astrophysical Journal v.419, p.255
Astronomy and Astrophysics
Astronomy
20
Accretion, Accretion Disks, Line: Formation, Magnetohydrodynamics: Mhd, Shock Waves, Stars: Mass Loss, Stars: Pre-Main-Sequence
Scientific paper
The observed broad, blueshifted, low-excitation metallic forbidden emission lines, [O I] λ6300, [S II] λλ6730, 6716 and [N II] λ6548, associated with young stellar objects (YSOs), are probes of the low-density regions of energetic outflows on scales ranging from 10 to 70 AU from the central engine. We investigate the idea that such lines are generating in oblique hydromagnetic shock waves in recollimating disk winds from YSOs. We solve for the typical postshock physical conditions that arise in such shocks. We find that conditions appropriate for forbidden line emission are produced in oblique shocks with modest fast magnetosonic Mach numbers n1 between 2 to 4. The highest velocity and density gas in the shocks is concentrated most toward the flow axis. Slower, lower density emitting material is farther from the flow axis. This situation preserves to some degree the conditions in the preshock disk wind. The postshock material expands away from the jet axis at angles up to 32°. Our results prepare the stage for the calculation of line profiles of the shocked, emitting gas which we present in the forthcoming second part of this investigation.
Ouyed Rachid
Pudritz Ralph E.
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