Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248...48h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Jan. 1, 1991, p. 48-51.
Astronomy and Astrophysics
Astronomy
19
Hydroxyl Emission, Interstellar Masers, Photodissociation, Star Formation, Abundance, Astronomical Models, Dark Matter, Early Stars
Scientific paper
The column densities of OH in dense equilibrium photodissociation regions which form in the vicinity of early-type stars are calculated. They lie in the range of several times 10 to the 15th/sq cm. The largest OH column densities are obtained in photodissociation regions with densities and sizes comparable to those thought to be typical of the hydroxyl-maser regions. The column densities of OH in hydroxyl masers in star-forming regions are probably several times higher than the maximum theoretical values. Hence photodissociation regions are possible sites for the hydroxyl masers, only if the observational lines-of-sight to them are at fairly small angles to their surfaces, a conclusion which is consistent with the generally accepted view that maser spots are longer than they are wide.
Hartquist Thomas W.
Sternberg Amiel
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