Detection of MgCN in IRC +10216: A new metal-bearing free radical

L. M. Ziurys, A. J. Apponi, M. Guélin, J. Cernicharo

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191 Scopus citations

Abstract

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 → 10, 10 → 9, and 9 → 8 transitions of this species, which has a 2Σ+ ground state, have been observed in the outer envelope of this object at 3 mm. For the N = 11 → 10 transitions, the two spin-rotation components are clearly resolved and conclusively identify this new radical. These measurements imply a column density for MgCN of Ntot ∼ 1012 cm-2 in the outer shell, which corresponds to a fractional abundance of f ∼ 7 ×10-10. 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 ∼ 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.

Original languageEnglish (US)
Pages (from-to)L47-L50
JournalAstrophysical Journal
Volume445
Issue number1 PART 2
DOIs
StatePublished - May 20 1995

Keywords

  • ISM: abundances
  • ISM: molecules
  • Line: identification
  • Radio lines: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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