Evidence of high excitation in the Herbig-Haro 111 jet

Details Evidence of high excitation in the Herbig-Haro 111 jet Evidence of high excitation in the Herbig-Haro 111 jet

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1133n&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 3, p. 1133-1138.

Astronomy and Astrophysics

Astronomy

19

Herbig-Haro Objects, Jet Flow, Stellar Spectrophotometry, Bow Waves, H Lines, Interstellar Extinction, Molecular Excitation, Shock Waves

Scientific paper

We obtained long slit spectrophotometric observations in the blue spectral region, 3600-5400 A, of the Herbig-Haro (HH) 111 jet in Orion. Our purpose was to search for the high excitation forbidden O III 5007 A line and medium-to-high excitation forbidden O II 3727/29 A lines in the internal condensations or knots of the jet. We found forbidden O III, which indicates shock velocities greater than 80 km/s, and strong forbidden O II in condensation L. The morphology and excitation of this condensation gives more support to a multiple bow shock structure in HH 111, and therefore, strengthens the case for a time variability of its source. Strong emission in forbidden O II was also found in most of the bright condensations, indicating shock velocities greater than 40 km/s. Estimates of the extinction in Herbig-Haro 111 give values of E(B-V) of about 1, a relatively large value for an optical HH object.

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