Other
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86...69l&link_type=abstract
Astronomical Journal, vol. 86, Jan. 1981, p. 69-83.
Other
26
Astronomical Spectroscopy, Early Stars, Formaldehyde, Gas Density, Molecular Clouds, Abundance, Astronomical Catalogs, Astronomical Maps, Line Spectra
Scientific paper
The H2CO molecule has been studied toward 25 regions containing signposts of recent star formation, either Herbig Be/Ae stars, LkH alpha emission-line stars, or stars with unusual circumstellar nebulosity. The 2-cm and 2-mm lines of H2CO have been detected toward many of these regions, allowing a determination of cloud density. Core densities from 20,000 per cu cm to 150,000 per cu cm are found to be associated with more than half of the regions studied. The cloud L 43 is unusual in being cold (kinetic temperature approximately 15 K) yet having a high density (150,000 per cm) more characteristic of the hotter regions of star formation. The H2CO abundances for these clouds with embedded young stars are the same as the abundances of other clouds of similar density that do not have embedded stars.
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