Physics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223..884s&link_type=abstract
Astrophysical Journal, Part 1, vol. 223, Aug. 1, 1978, p. 884-887, 889, 891-900.
Physics
189
Astronomical Models, Radial Velocity, Shock Wave Propagation, Spectral Line Width, Stellar Evolution, Stellar Radiation, Bow Waves, Early Stars, Line Spectra, Main Sequence Stars, Plane Waves, Stellar Winds
Scientific paper
Detailed data on radial velocities and emission-line widths are presented for Herbig-Haro object No. 1 (HH 1) and seven of the condensations in HH 2. A theoretical model is proposed in which a strong stellar wind from an embedded pre-main-sequence star produces shock waves upon interaction with small ambient clouds, and radiating gas from bow shocks forms around dense cloudlets. A simple steady-state model of the stellar wind and its interaction with the interstellar medium is analyzed, and the physics of the interaction between the wind and a dense cloudlet is investigated. The ability of the proposed model to explain the salient observational features of HH objects is tested by comparison with the data obtained for HH 1 and HH 2. It is shown that the model provides plausible explanations for the low-excitation emission-line spectra, the radial velocities, the line widths, the total luminosity and variational time scale of a given condensation, and the lack of spatial coincidence between the nebular condensations and IR sources discovered near some HH objects. The model is less successful in accounting for the large velocity dispersion suggested by the line widths and the polarization observed in certain HH objects.
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