Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..344w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 344-352.
Astronomy and Astrophysics
Astronomy
36
Herbig-Haro Objects, Hydrogen, Molecular Gases, Rotational Spectra, Shock Heating, Vibrational Spectra, Emission Spectra, H Alpha Line, Line Spectra, Pre-Main Sequence Stars, Wave Excitation
Scientific paper
The results of an H2 emission-line survey of the 1-0 S(1) transition from 33 Herbig-Haro objects and suspected Herbig-Haro objects are presented. The survey focuses on Herbig-Haro objects that have been recently identified and/or lie at southern declinations. Data are also presented for the 2-1 S(3), 1-0 Q(1), and 1-0 Q(3) transitions of H2 for a subset of the sample. H2 emission has been detected toward 16 Herbig-Haro or nebulous objects; published optical spectra of 13 of these objects suggest that they are low-excitation nebulae associated with low-velocity shocks. H2 has also been detected toward the emission-line stars RU Lup and LkH-alpha 234. Extended 1-0 S(1) emission has been mapped in the vicinity of gas outflows associated with the emission-line stars R CrA and LkH-alpha 234 and appears to delineate the blueshifted molecular gas in these bipolar outflows. A comparison of the data, in combination with the atomic line data from these HHs, is made with current C- and J-type shock models.
Mundy Lee G.
Schultz A. S. B.
Schwartz Richard D.
Wilking Bruce A.
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