Optical and radio study of the Taurus molecular cloud toward HD 29647

Details Optical and radio study of the Taurus molecular cloud toward HD 29647 Optical and radio study of the Taurus molecular cloud toward HD 29647

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..604c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. 604-617.

Astronomy and Astrophysics

Astronomy

82

Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Radio Astronomy, Visible Spectrum, Abundance, Cosmic Dust, Line Spectra, Radio Observation

Scientific paper

Combined optical and radio observations of the Taurus molecular cloud near HD 29647 is presented. The optical observations were made in the wavelength range 5000-9000 A using the Mt. Wilson 2.5-m telescope and a coude spectrograph. Radio observations were carried out using the 36-foot millimeter-wave telescope of the NRAO with a filter bank resolution and separation of 100 kHz. The optical observations showed strong interstellar lines of CN and C2, and only moderately strong CH and K(I) lines. Lines of CH(+), NH2, SiH, MgH, C3 and CO(+) were not detected. Interstellar lines of CO, 13-CO, C(18-O), HCN, and HCO(+) were detected only in the millimeter wave observations. The density of H2 in the cloud was 800 per cu cm, and a kinetic temperature of 10 K was derived. Indirect evidence was found for the depletion of sulfur, which is normally undepleted in diffuse clouds. The molecular abundances are found to be in agreement with the theoretical calculations of gas-phase chemistry. The complete molecular abundance data are given in a table.

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