Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....95..143t&link_type=abstract
Astronomy and Astrophysics, vol. 95, no. 1, Feb. 1981, p. 143-155.
Astronomy and Astrophysics
Astrophysics
107
Cosmic Dust, Cyano Compounds, Interstellar Gas, Molecular Clouds, Molecular Spectra, Stellar Evolution, Abundance, Acetylene, Ammonia, Cyanoacetylene, Dynamic Response, Gas Temperature, Gas Transport, Line Spectra, Spectral Resolution
Scientific paper
The molecular condensation TMC 1 in the Taurus dust cloud is studied with high spectral and spatial resolution using the Effelsberg telescope in the J equals 1-0 transition of HC3N, the J equals 9-8 transition of HC5N, the J equals 8-7 and 21-20 transitions of HC7N as well as in the (J,K) equals (1,1) and (2,2) inversion transitions of NH3. Additional observations are made of the J equals 5-4 transition of HC3N using the NRAO 36-foot telescope. It is noted that the system (4-40 solar masses) may be close to being in hydrostatic equilibrium. The consequences of both a disk and a filamentary geometry for TMC 1 are discussed, and it is concluded that it is more likely to be an edge-on disk. Also discussed are the deviations from LTE in the J equals 1-0 transition of HC3N; here it is concluded that slight deviations exist but not in the sense that simple theory would predict.
Churchwell Edward
Toelle F.
Ungerechts Hans
Walmsley Charles Malcolm
Winnewisser Gisbert
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