Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..443k&link_type=abstract
Astrophysical Journal, vol. 206, June 1, 1976, pt. 1, p. 443-451.
Astronomy and Astrophysics
Astrophysics
57
Carbon Monoxide, Interstellar Matter, Molecular Spectra, Nebulae, Radio Spectra, Astronomical Models, Brightness Temperature, Cosmic Dust, H Alpha Line, H Ii Regions, Radial Velocity, Stellar Evolution
Scientific paper
The 2.6-mm lines of (C-12)O and (C-13)O have been observed toward the small galactic diffuse nebulae NGC 1579 (S222) and S239. The H92-alpha recombination line has also been detected from NGC 1579. Toward NGC 1579, evidence was observed for self-absorption in the (C-12)O line. For both regions, high-velocity wings and line broadening are observable in the (C-12)O line; the features observed toward S239 suggest ordered free-fall collapse of a localized region of the cloud onto a newborn stellar cluster. Examination of the available data suggests that NGC 1579 is both a reflection nebula (illuminated by LKH-alpha 101) and an obscured H II region excited by a star of spectral type near B1, while S239 is a reflection nebula or a Herbig-Haro object. The present studies of these regions show that line widening in CO is at least as important an indicator of star-formation activity as enhanced line emission.
Brown Raymon L.
Knapp Gillan R.
Knapp S. L.
Kuiper Thomas B. H.
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