Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..673b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 15, 1984, p. 673-678.
Astronomy and Astrophysics
Astronomy
63
Absorption Spectra, Infrared Astronomy, Infrared Spectra, Interstellar Extinction, Molecular Clouds, Background Radiation, Carbon Monoxide, Line Spectra, Molecular Spectroscopy, Point Sources
Scientific paper
A high-resolution infrared spectrum of NGC 2024 IRS 2 shows strong interstellar absorption lines in the v = 2-0 band of CO. A temperature T = about 44 K and column density N(CO) = about 8 x 10 to the 18th/sq cm can be inferred from the data. The bulk of the molecular gas in this line of sight has a very small velocity dispersion, Delta V less than 1.45 km/sec. The observations provide the first sensitive, direct limit upon the CO abundance in a molecular cloud: CO/H2 greater than 820,000, a value that is only barely consistent with some values adopted in the recent literature. Broad Brackett-gamma emission observed from NGC 2024 IRS 2 is interpreted as being due to a thermally excited stellar wind with an inferred mass-loss rate of 3 x 10 to the -7th solar mass/yr. A derived upper limit on the stellar temperature of 20,000 K is further evidence against IRS 2 being the exciting star for NGC 2024.
Black John Harry
Willner Steve P.
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