Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..256s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 1, p. 256-260
Astronomy and Astrophysics
Astrophysics
28
Herbig-Haro Objects, Hydrogen Isotopes, Infrared Spectra, Rotational Spectra, Shock Waves, Star Formation, Vibrational Spectra, Shock Layers, Shock Wave Interaction, Shock Wave Propagation, Spectrum Analysis, Stellar Models
Scientific paper
The nature of shocks in star-forming clouds can be deduced from the infrared spectra of molecular hydrogen emission lines. The first clear evidence for a jump (J)-shock within dense molecular gas is found on analyzing the published results for the bipolar outflow Herbig-Haro (HH) 90/91 (Gredel et al. 1992). The rotational and vibrational lines of H2 correspond to J-shocks with standard quiescent-cloud chemistry any speed in the range 12 - 21 km/s. No alternative shock physics can be applied with satisfaction. The relatively high level of ionization required to produce a J-shock (as opposed to a C-shock) is consistent with the dense gas being located near the edge of the cloud, thus being directly exposed to the UV of a nearby OB association. Limits to the near infrared (FeII) emission lines are used as a further test. It is shown how to employ these line strengths to distinguish between shock types in HH objects.
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