Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..317s&link_type=abstract
Astronomy and Astrophysics, vol. 97, no. 2, Apr. 1981, p. 317-324. Research supported by the Academy of Finland and Magnus Ehrn
Astronomy and Astrophysics
Astronomy
26
Hydroxyl Emission, Interstellar Extinction, Molecular Clouds, Radio Sources (Astronomy), Astronomical Maps, Formaldehyde, Ground State, Nebulae, Sky Surveys (Astronomy)
Scientific paper
Observations of OH and CH have been performed towards the high galactic latitude cloud L 1642. Star counts of the cloud indicate that most of the cloud has a very moderate extinction. Only in an area of 15 x 10 arcmin does the blue extinction exceed 2m. CH appears to be well correlated with the extinction. In OH, which was observed with higher velocity resolution, two distinct velocity components were resolved: one narrow component which corresponds to a compact core, and one broader component corresponding to a more diffuse 'halo' region. Near the cloud center a hitherto unnoticed small bright nebula (cometary nebula), clearly visible on both the blue and the red Palomar Sky Survey print, was found. The molecular data are used to determine in the center region the hydrogen density, the kinetic temperature, the fractional ionization as well as the infrared radiation field due to dust grains.
Johansson Lars E. B.
Mattila Kalevi
Quang Rieu Nguyen
Sandell Goeran
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