Spectrophotometric evidence for velocity variability in the HH 34 and HH 111 stellar jets

Details Spectrophotometric evidence for velocity variability in the HH 34 and HH 111 stellar jets Spectrophotometric evidence for velocity variability in the HH 34 and HH 111 stellar jets

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1139m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 3, p. 1139-1155.

Astronomy and Astrophysics

Astronomy

42

Herbig-Haro Objects, Jet Flow, Stellar Spectrophotometry, Boundary Layer Stability, Density Distribution, H Alpha Line, Interstellar Extinction, Shock Waves

Scientific paper

We present Fabry-Perot observations and long-slit spectrophotometry of the collimated jet regions of the HH 34 and HH 111 outflows. There is a close correlation between the observed forbidden S II flux and the electron density in the bright low-excitation knots in both the HH 34 jet and the HH 111 jet. The electron densities in some of the low-excitation HH 111 jet knots exceed 2500/cu cm, from which we infer that the true gas densities may be significantly higher than 10 exp 4/cu cm because the peak ionization is only a few percent for such weak shocks. We detect weak forbidden O III 5007 A emission from the HH 111 jet knot L, which implies that the shock velocity for this knot is 100 km/s. This knot also has a large velocity dispersion (200 km/s) and bow-shaped morphology (Reipurth et al., 1992). We argue that such a feature cannot be explained by models in which knots correspond to internal shock waves excited by boundary layer instabilities, but is consistent with an internal working surface in a velocity-variable outflow. We review evidence for multiple ejections in each of these stellar jets.

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