Other
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213...71b&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 71-78.
Other
28
Abundance, Carbon Monoxide, Carbon Stars, Infrared Spectra, Stellar Spectra, Carbon Isotopes, Mass Ratios, Nebulae, Oxygen Isotopes, Stellar Evolution, Stellar Spectrophotometry
Scientific paper
The IR-emitting core and shell of IRC +10216 are investigated using a high-resolution spectrum covering the wavelength interval between 3 and 5 microns. Line identifications made or confirmed include those due to (C-12)(O-16), (C-13)(O-16), (C-12)(O-17), and (C-12)(O-18). A mean heliocentric velocity of about -32 km/s is obtained from the 42 least blended (C-12)O and (C-13)O lines, and the following isotopic abundance ratios are derived by comparing equivalent widths of the observed lines: C-12/C-13, C-12/C-14, O-16/O-17, and O-17/O-18. The structure of the expanding gas shell is examined, an explanation is offered for the lack of P Cygni profiles in the spectrum, and an unsuccessful search for other molecules is briefly discussed. It is concluded that a low C-12/C-13 ratio is not necessarily a signature of a carbon star.
Barnes Th. G.
Beer Reinhard
Hinkle Kenneth H.
Lambert David L.
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