Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..685w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. 685-704.
Astronomy and Astrophysics
Astrophysics
36
Absorption Spectra, Interstellar Matter, Line Spectra, Monatomic Gases, Pleiades Cluster, Star Clusters, Visible Spectrum, Abundance, Centimeter Waves, Interstellar Gas, Molecular Gases, Radio Spectra, Stellar Spectrophotometry
Scientific paper
The absorption lines of 15 Pleiades stars were scanned to characterize the interstellar gas in that direction and examine mechanisms responsible for enhanced CH(+) abundances detected. Differential absorptions by Ca II and CH(+) were observed and taken as evidence for a region of primary gas far from the cluster along the line-of-sight. A second region was in the cluster and composed of heated, ionized molecular gas with a 0.3 pc thickness at most. A reaction was defined that produced the CH(+) after C(+) clouds encountered photoelectric emission from dust grains with temperatures over 1000 K. The data on emissions near the reddened stars of the Pleiades group are useful for testing models of the interaction of molecular clouds and clusters.
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