Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67..129p&link_type=abstract
Astronomy and Astrophysics, vol. 67, no. 1, June 1978, p. 129-137.
Astronomy and Astrophysics
Astronomy
36
Astronomical Spectroscopy, Carbon, Nebulae, Radio Astronomy, Radio Spectroscopy, Atomic Recombination, Formaldehyde, Hydroxyl Emission, Infrared Astronomy, Line Spectra, Near Infrared Radiation
Scientific paper
Observations were made of carbon recombination-line spectra toward several reflection nebulae which are illuminated by B-type stars. OH and H2CO spectra were observed in order to sample some of the characteristics of the molecular clouds in the vicinity of these nebulae. The compact C II region toward NGC 2023 was found to be centered about 1 arcmin south of the illuminating star. The electron density of this C II region is probably 10-25 per cu cm. C158-alpha was detected toward both NGC 2068 and NGC 2071 (both M78); the electron density in this ionized-carbon region is probably of the order of 1 per cu cm. A sulfur recombination line was detected toward NGC 2068. C158-alpha was detected toward the illuminating star of NGC 7023, but the ionized carbon is probably centered about 4 arcmin east of this star at the position of a radio continuum source and a CO 'hotspot'. Carbon lines were not detected toward NGC 1333, NGC 7129, or S140.
Pankonin Vernon
Walmsley Charles Malcolm
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