Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137...17g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 1, Aug. 1984, p. 17-25. Sponsorship: Deutsche Forschungsgemeinschaft.
Astronomy and Astrophysics
Astrophysics
34
Ammonia, Crab Nebula, Molecular Clouds, Star Distribution, Astronomical Spectroscopy, Brightness Temperature, Interstellar Extinction, Line Spectra, Radial Velocity, Stellar Evolution, Taurus Constellation
Scientific paper
The NH3(1,1) and (2,2) lines have been observed towards the cores of the clouds L1489, Taurus 3C, TMC1, and L1517 in the Taurus-Auriga dark cloud complex. From these measurements the authors estimate the gas kinetic temperature to be close to 10K and the gas density to be in the range 104cm-3- 105cm-3. For the central Taurus region and the isolated filament L1517 the visual extinction Av has been determined from star counts in 4arcmin.5×4arcmin.5 fields. The measurements show that Av = 6m is a lower limit for the visual extinction in the densest parts of the optical condensations. The cloud sizes derived from the extinction maps suggest that the elongated clouds tend to break into smaller cloudlets by fragmentation along their major axis.
Gaida Manfred
Ungerechts Hans
Winnewisser Gisbert
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