Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254..543t&link_type=abstract
Astrophysical Journal, Part 1, vol. 254, Mar. 15, 1982, p. 543-549.
Astronomy and Astrophysics
Astronomy
14
Astronomical Spectroscopy, Infrared Astronomy, Interstellar Gas, Molecular Clouds, Near Infrared Radiation, Orion Nebula, Emission Spectra, Hydrogen Atoms, Infrared Spectroscopy, Luminosity, Ultraviolet Absorption
Scientific paper
The two brighter near-infrared sources in Orion Molecular Cloud 2, IRS 3 and 4, were observed at moderate spectral resolution in the near-infrared. At least eight members of the V = 1-0 and V = 2-1 rotation-vibration series of H2 were found in IRS 4. The line ratios and intensities argue that the source is shock-excited, with an excitation temperature of 3000 + or - 800 K. Ultraviolet pumping of the H2 appears unlikely, but perhaps not by a large factor. The values determined for extinction and excitation of IRS 4 are consistent with previous determinations of a middle B ZAMS object, extinguished by 10-15 visual magnitudes. The region of H2 emission, however, is more probably extinguished by 20-30 magnitudes.
Thompson Rodger I.
Thronson Harley A. Jr.
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