The circumstellar and nebular environment of the Becklin-Neugebauer object - 2-5 micron wavelength spectroscopy

Details The circumstellar and nebular environment of the Becklin-Neugebauer object - 2-5 micron wavelength spectroscopy The circumstellar and nebular environment of the Becklin-Neugebauer object - 2-5 micron wavelength spectroscopy

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275..201s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. 201-224. Research supported by the Guggenheim Foundat

Astronomy and Astrophysics

Astrophysics

159

Abundance, Hydrogen Clouds, Infrared Stars, Molecular Clouds, Orion Nebula, Stellar Envelopes, Stellar Winds, Carbon Monoxide, H Lines, Infrared Spectra, Radial Velocity, Spectral Line Width, Stellar Models, Stellar Motions

Scientific paper

The authors present extensive new spectroscopic observations of the BN source in Orion throughout the atmospheric windows from λ = 2 - 5 μm. These bandpasses include the molecular bands of CO (Δv = 1 and Δv = 2) and H2 (Δv = 1), the hydrogen recombination lines (Brα, Brγ, Pfβ, Pfγ, and Hu 13 - 19), and previously undetected features due to Na I, Fe II, and CO. Four distinct regimes in the circumstellar and line-of-sight gas can be identified from the data: (1) an ultradense, ionized stellar wind with outer boundary at 20 AU and density ne ≈ 1.3×107cm-3 at 20 AU; (2) a highly confined region of excited molecular gas with nH2 ≡ 1012cm-3 and T ≈ 3500K; (3) a circumstellar envelope with nH2 ≈ 107cm-3 and T ≈ 600K; and (4) low-excitation molecular gas at T ≈ 150K lying along the line of sight in OMC-1 and the "plateau" source. Velocity measurements of several newly discovered atomic emission lines and molecular absorption systems confirm the peculiar redshifted velocity of BN compared to the OMC-1 molecular cloud.

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