Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235l.137b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 235, Feb. 1, 1980, p. L137-L141.
Astronomy and Astrophysics
Astrophysics
31
Herbig-Haro Objects, Line Spectra, Shock Waves, Stellar Spectrophotometry, Emission Spectra, Forbidden Bands, Stellar Envelopes
Scientific paper
Spectrophotometric observations show that H-H 7 and H-H 11 belong to a class of very low-excitation Herbig-Haro objects of which H-H 47 has been the only known example. Typical properties include line flux ratios which are considerably larger than 1, very strong (O I) and (C I) lines, as well as relatively faint (O II) lines. So far no shock-wave models are available for these low-excitation objects. H-H 7 and H-H 11 have electron densities which are lower by about one order of magnitude, and electron temperatures which are slightly lower than those for high-excitation objects.
Boehm Karl-Heinz
Brugel Edward W.
Mannery E.
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