Other
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..489f&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 489-496.
Other
34
Abundance, Carbon Dioxide, Infrared Spectra, Molecular Spectra, Novae, Stellar Spectra, Carbon Isotopes, Emission Spectra, Molecular Oscillations, Molecular Rotation, Stellar Spectrophotometry
Scientific paper
The detection of first-overtone vibration-rotation emission bands of CO at 2.3 microns from Nova NQ Vul is reported. These bands were detected in a 1.6-2.4-micron spectrum obtained shortly after the first sharp drop in visual magnitude. It is suggested that the previously discovered 5-micron excess can be identified with emission in the stronger fundamental bands of CO and that the CO emission originates within or near the nova ejecta. A temperature of 3500 + or - 750 K is derived, a lower limit of 3 is placed on the C-12/C-13 isotopic abundance ratio, and the fundamental-band CO emission at 4.8 microns is predicted to be approximately 40 times stronger than the first-overtone emission at 2.3 microns. Other emission lines in the spectrum are identified as recombination lines of H, C, and Na. A model of the ionization structure of the ejecta is presented which can explain in a semiquantitative way several important features of the spectrum.
Ferland Gary J.
Hall Donald N. B.
Lambert David L.
Netzer Hagai
Ridgway Stephen T.
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