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1999ApJ...526..274H - Astrophys. J., 526, 274-278 (1999/November-3)
He II line emission as a tracer of nonradiative preionized shocks: application to winds and circumstellar disks in the Orion nebula.
HARTIGAN P.
Abstract (from CDS):
New narrowband images of the Trapezium region of Orion in He II λ4686 and the adjacent continuum near this wavelength fail to show any He II emission signatures from shocks. Upper limits on the He II fluxes in these images, combined with predictions of the brightness of He II λ4686 in nonradiative shocks, give an upper limit to the mass-outflow rate from Θ1 Ori C consistent with the mass-loss rate estimated from UV observations. The new images show that HH 202 represents the superposition of two bow shocks moving in opposite directions, which explains some anomalies seen previously in emission-line images of this source taken with Hubble Space Telescope (HST).
Abstract Copyright: ∼
Journal keyword(s): ISM: individual (Orion Nebula) - Shock Waves
Simbad objects: 3
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