Gas dynamics in the circumstellar Nebula on the Becklin-Neugebauer source

Details Gas dynamics in the circumstellar Nebula on the Becklin-Neugebauer source Gas dynamics in the circumstellar Nebula on the Becklin-Neugebauer source

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982nyasa.395..125s&link_type=abstract

(NASA, National Science Foundation, New York Academy of Sciences, et al., Symposium on the Orion Nebula to Honor Henry Draper, N

Astronomy and Astrophysics

Astronomy

1

Gas Dynamics, Infrared Spectroscopy, Molecular Clouds, Orion Nebula, Stellar Envelopes, Astronomical Models, Carbon Monoxide, Early Stars, H Ii Regions, Line Spectra, Photoionization, Protostars

Scientific paper

This review summarizes the results from high-resolution spectroscopy of the Becklin-Neugebauer source in Orion. The windows observed between λ = 2 μm and λ = 5 μm show molecular bands of CO, 13CO, and H2, a doublet of Na I, and four recombination lines of hydrogen originating from two distinct ionized and molecular zones near BN: (1) an ultrahigh-density H II region (ne ≅ 108 cm-3), with a radius ⪉15 AU, and (2) a high-excitation molecular region extending from 0.3 to 25 AU with physical conditions nH2 ⪆ 1011 cm-3 and T ≅ 3500K down to nH2 ≅ 107 cm-3 and T ≅ 600K. To reconcile the existence of a large circumstellar H II region with dense neutral gas much closer to BN, a possible model is proposed, in which the neutral gas close to BN is confined to a circumstellar disk and the H II gas is situated in hemispheres above and below the disk.

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