Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.261..296b&link_type=abstract
Nature, vol. 261, May 27, 1976, p. 296-298. NSF-supported research.
Physics
9
Emission Spectra, Infrared Spectra, Novae, Stellar Spectra, Forbidden Transitions, H Lines, Helium
Scientific paper
It is noted that a number of emission lines in the IR spectrum of Nova Cygni 1975 have been identified with forbidden transitions in highly ionized forms of Mg, Ca, Al, and Si. Based on temperature arguments, the present letter proposes that these lines are all due to He I with one possible exception. The wavelengths of the observed emission features are listed, and the cited lines are identified as strong He I recombination lines. The existence of regions in the nova with temperatures of the order of 100,000 K is shown to be physically reasonable. It is concluded that the He I emission might originate in a hot dense medium near the underlying star and that the previous identification of two lines with the forbidden Ca IV ion may indeed be correct.
Black John Harry
Gallagher Jay S.
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