Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..197s&link_type=abstract
Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 197-203. Research supported by the University of Missouri
Astronomy and Astrophysics
Astrophysics
26
Astronomical Models, Emission Spectra, Herbig-Haro Objects, Nebulae, Shock Waves, Stellar Winds, Bow Waves, H Lines, Line Spectra, Main Sequence Stars, Nitrogen, Radial Velocity
Scientific paper
High dispersion echelle spectra of Herbig-Haro objects are reported with emphasis upon HH 1. In HH 1 the higher excitation nebular lines exhibit radial velocities from 10 to 15 km/s more negative than the low excitation lines. Also, the full line widths at zero intensity of the higher excitation lines are greater than those of the low excitation lines. The results are discussed with regard to the cloudlet bow-shock model for HH objects. A strong pre-main-sequence stellar wind entering the bow shock at about 90 km/s produces the (optical) HH nebula. The resultant pressure on the front of the cloudlet drives a second shock into the cool, dense cloudlet, and it is suggested that this gives rise to H2 line emission recently detected in HH objects.
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