Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..626f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 626-631. Research supported by the Robert A. Welch F
Astronomy and Astrophysics
Astronomy
27
Interstellar Chemistry, Molecular Clouds, Pleiades Cluster, Radio Sources (Astronomy), Star Clusters, Abundance, Carbon Monoxide, Emission Spectra, Gas Density, Hydroxyl Emission, Interstellar Extinction, Optical Thickness
Scientific paper
The central region of a small, low density molecular cloud, which lies to the south of the Pleiades cluster, has been studied through the use of molecular line observations. Column densities for CH, OH, (C-12)O, and (C-13)O are derived from the radio data. The CH and OH data yield a visual extinction through the center of the cloud of about 3 mag. The ratio of the antenna temperatures for the OH main lines is consistent with optically thin emission; therefore, the OH results are a good indication of the total extinction through the cloud. The analysis of the carbon monoxide data produces a relatively high kinetic temperature of at least 20 K a low total gas density of about 300-500 per cu cm, and a column density of about 4 x 10 to the 17th per sq cm for (C-12)O. Thus this small molecular cloud is not typical of the molecular material generally studied in Taurus.
Federman Steven Robert
Willson Robert F.
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