Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127..195k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 1, Oct. 1983, p. 195-200.
Astronomy and Astrophysics
Astronomy
16
Astronomical Spectroscopy, Cosmic Dust, Infrared Astronomy, Molecular Clouds, Stellar Evolution, Astronomical Models, Cosmic Gases, Gas Temperature, Globules, Near Infrared Radiation, Spectral Line Width
Scientific paper
Near infrared and 1 mm observations of B 335 have been made. A hitherto unknown object in the direction of the cloud center is found. These observations are used together with previous data to derive a consistent model for the lines and the continuum. For energetic reasons, a protostellar origin for the dust emission is favored in B 335. The alternative of heating from outside cannot be excluded, although the interstellar radiation field would have to be four times stronger than in the solar neighborhood. The models do not permit the presence of ordinary small graphite particles, which would lead to excessive 100 micron emission. The thermal balance of the gas is dominated by CO cooling and cosmic ray heating. The cloud as a whole is probably in hydrostatic equilibrium and the turbulence of the gas is consistent with Alfven waves. Chemical fractionation of (C-13)O in the outer parts of the cloud is found, and the isotopic ratios of C-12/C-13 and S-32/S-34 are cosmic.
Kruegel Endrick
Sherwood W. A.
Stenholm Lars G.
Steppe H.
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