A search for CH abundance variations towards L134

Details A search for CH abundance variations towards L134 A search for CH abundance variations towards L134

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..347j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 2, Feb. 1987, p. 347-351.

Astronomy and Astrophysics

Astrophysics

Abundance, Astronomical Spectroscopy, Dark Matter, Hydrocarbons, Interstellar Extinction, Interstellar Chemistry, Limb Brightening, Molecular Clouds, Radio Spectra, Visible Spectrum

Scientific paper

The aim of this work is to study the relation between emission in the ground state of CH (around 9 cm) and visual extinction in some dark clouds selected for their large values of >Av<. Observations of CH were made with the Nançay radiotelescope (HPBW 2arcmin×10arcmin) at different positions in the dark cloud L134. Models of interstellar chemistry applied to dark clouds suggest the possible observation of a limb brightening effect which was not found here for directions where >Av< ⪆ 4.0 magnitudes. The projected density of CH derived in L134 (N(CH) ≡ 0.2 - 1.5×1014cm-2) is discussed in the light of model calculations.

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