Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..145k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 145-149. Research supported by NSF.
Astronomy and Astrophysics
Astronomy
18
Herbig-Haro Objects, Line Spectra, Molecular Spectra, Stellar Winds, Carbon Compounds, Flow Velocity, Infrared Sources (Astronomy), Interstellar Gas, Magnetohydrodynamic Flow, Oxygen Compounds
Scientific paper
The characteristics of CO J = 2-1 lines of extremely high velocity (EHV) molecular gas near HH 7-11 are described. The CO J = 2-1 to J = 1-0 line ratio in the EHV wing implies a large gas density of 1000 or 10,000/cu cm, depending on whether CO molecules are excited by collisions with H2 or H. While the results are not inconsistent with the EHV CO wing being the emission from CO molecules formed in the neutral stellar wind, the implied large gas density suggests that the wind is not homogeneous but rather blows in either lumps, filaments, or sheets. An upper limit of 0.01 is obtained for the abundance ratio SiO/CO in the EHV gas, which is consistent with a chemical model for neutral stellar winds.
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