Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183l..10c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. L10-L12.
Astronomy and Astrophysics
Astronomy
160
Abundance, Astronomical Spectroscopy, Infrared Sources (Astronomy), Metal Halides, Stellar Atmospheres, Stellar Envelopes, Aluminum Chlorides, Aluminum Fluorides, Interstellar Matter, Line Spectra, Potassium Chlorides, Sodium Chlorides
Scientific paper
The authors report the first detection of metal halides in IRC +10216. The millimetre-wave line profiles suggest that these species are concentrated in the inner circumstellar envelope. The abundances derived for NaCl, AlCl, KCl, and tentatively for AlF, are in the range 1012 - 1014cm-2 and are 106 - 108times lower than the abundance of H2. They agree with the chemical equilibrium abundances calculated by Tsuji (1973) for a carbon-rich stellar atmosphere with a temperature 1200 - 1500K. The lines of NaCl and AlCl, observed with the IRAM 30m telescope, are strong enough to allow the detection of these species' rare 37Cl isotopes. The derived 35Cl/37Cl isotopic ratio (2.3±0.5) is consistent with the terrestrial elemental isotopic ratio.
Cernicharo Jose
Guélin Michel
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