HCN emission and nitrogen-bearing molecules in oxygen-rich circumstellar envelopes

Details HCN emission and nitrogen-bearing molecules in oxygen-rich circumstellar envelopes HCN emission and nitrogen-bearing molecules in oxygen-rich circumstellar envelopes

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...210..225n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 210, no. 1-2, Feb. 1989, p. 225-235.

Astronomy and Astrophysics

Astrophysics

69

Emission Spectra, Hydrocyanic Acid, Infrared Stars, Stellar Envelopes, Stellar Spectrophotometry, Supergiant Stars, Abundance, Irregular Variable Stars, Nitrogen, Oxygen, Peculiar Stars, Stellar Evolution, Thermodynamic Equilibrium

Scientific paper

HCN (J = 1-0) emission has been detected in four new O-rich circumstellar envelopes, IRC + 10011, NML Cyg, VY Cma, and VX Sgr. The implications of these data for the abundance of HCN are discussed, and a photochemical model is used to explore the possibility of nitrogen-bearing molecules, particularly HCN, forming in the intermediate layers of oxygen-rich envelopes. Chemical reactions are examined between daughter molecular species produced from the photodissociation by the UV Galactic radiation field of the mother molecules formed in regions closer to the central star. The central role played by the neutral reactions in the chemical activity of the oxygen-rich circumstellar envelopes is addressed, as opposed to the carbon-rich ones in which cosmic ray ionization and photodissociation and photoionization of C2H2 lead to a complex ion-molecule chemistry.

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