Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...445l..47z&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 445, no. 1, p. L47-L50
Astronomy and Astrophysics
Astrophysics
71
Abundance, Carbon Compounds, Free Radicals, Interstellar Matter, Late Stars, Magnesium Compounds, Metallicity, Isomers, Nitrogen Compounds, Reaction Products, Stellar Envelopes
Scientific paper
A new metal-containing molecule, MgCN, has been detected toward the late-type star IRC + 10216, using the NRAO 12 m and IRAM 30 m telescopes. The N = 11 approaches 10, 10 approaches 9, and 9 approaches 8 transitions of this species which has a 2Sigma+ ground state, have been observed in the outer envelope of this object at 3 mm. For the N = 11 approaches 10 transitions, the two spin-rotation components are clearly resolved and conclusively identify this new radical. These measurements imply a column of density for MgCN of Ntot approximately 1012/sq cm in the outer shell, which corresponds to a fractional abundance of f approximately 7x10-10. This molecule, the metastable isomer of MgNC, is the third metal-bearing species thus far identified in the outer shell of IRC + 10216, and its detection implies a ratio of MgNC/MgCN approximately 22/1. MgCN may be formed through a reaction scheme involving magnesium and HNC or CN, both prominent outer shell molecules, or through synthesis on grains.
Apponi Aldo Joseph
Cernicharo Jose
Guélin Michel
Ziurys Lucy M.
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