CO line formation in bipolar flows. III - The energetics of molecular flows and ionized winds

Details CO line formation in bipolar flows. III - The energetics of molecular flows and ionized winds CO line formation in bipolar flows. III - The energetics of molecular flows and ionized winds

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..274c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 274-284.

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143

Carbon Monoxide, Early Stars, Line Spectra, Molecular Flow, Stellar Luminosity, Stellar Winds, Astronomical Models, Computational Astrophysics, Ionized Gases, Radio Emission, Stellar Radiation

Scientific paper

We compute from published CO line observations the force and mechanical luminosity of swept-up molecular gas in sixteen bipolar flows, using a consistent and accurate procedure. Resulting correlations between these molecular flow parameters and the bolometric luminosity of the source driving the flow are much tighter than previously found. We then reconsider the connection between molecular flows and ionized winds detected in the centimetric radio range. We find new correlations between flow parameters and 6cm radio flux. Implications of these results are discussed in the framework of three simple models for the flow/wind interaction, namely (i) flow driven by the momentum of a fast ionized wind; (ii) flow driven by the thermal pressure of a fast ionized wind; and (iii) flow driven by the momentum of a moderately slow, neutral wind. Constraints on the wind-driving mechanism are derived in each case. The correlation between 6cm flux and bolometric luminosity of the central source suggests that Balmer continuum photo-ionization may be important in low luminosity outflow sources.

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