Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...104..101b&link_type=abstract
Astronomy and Astrophysics, vol. 104, no. 1, Dec. 1981, p. 101-115.
Astronomy and Astrophysics
Astrophysics
55
Hydrogen Clouds, Interstellar Chemistry, Isotopic Enrichment, Molecular Clouds, Taurus Constellation, Astronomical Maps, Carbon 13, Emission Spectra, Interstellar Extinction, Line Spectra, Oxygen 18, Plasma Clouds, Spatial Resolution, Star Distribution, Telescopes
Scientific paper
The J equals 1-0 transition of HCO(plus), H13CO(plus), (C-13)O, and C18O were observed in the direction of several Taurus dark clouds. Maps of HCO(plus) show that the extent of molecular clouds is well correlated with visual extinction. The typical size at half intensity of HCO(plus) clouds is about 4-8 arcmin; smaller globules (less than 3 arcmin) were also revealed by the star counts. The apparent intensity ratio HCO(plus)/H13CO(plus), in the range of 1-10, and the relatively low HCO(plus) intensity are explained by self-absorption in HCO(plus). Asymmetric HCO(plus) line profiles were obtained in several sources, and a model is used to estimate the column densities in the two components. Corrected antenna temperatures are in the range of 1-5 K for (C-13)O and 0.5-1.5 K for C18O. Column densities of C18O and (C-13)O show that (C-13)O fractionation does generally occur. Finally, C-13 emission was detected in every sampled cloud direction, showing that double velocity components are frequent in the Taurus clouds.
Baudry Alain
Cernicharo Jose
de La Noë Jérôme
Despois Didier
Pérault Michel
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