Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.259..187g&link_type=abstract
Nature, vol. 259, Jan. 22, 1976, p. 187-189.
Physics
50
Coronas, Infrared Spectra, Near Infrared Radiation, Novae, Stellar Spectra, Aluminum, Forbidden Transitions, Helium, Line Spectra, Silicon, Stellar Temperature
Scientific paper
Two phases in the spectral development of Nova Cygni 1975 are discussed: a period shortly after maximum when the 2-micron and 3-micron spectral regions were dominated by the lines of hydrogen and a few lines of neutral helium superposed on a continuum presumably of free-free radiation, and the recent period when additional lines have nearly dominated the same spectral regions. The derived wavelengths and proposed identifications of the new lines are presented. It is shown that the near-IR spectrum of this nova is now dominated by forbidden lines arising from highly ionized species of Mg, Al, and Si; these lines are analogous to the coronal lines observed in the visible portion of the solar spectrum. These results are shown to imply that a region with a very high temperature (about 1 million K) must be developing within the nova material and that the degree of ionization is still increasing. Since the nova's visible spectrum does not yet exhibit any coronal lines, it is concluded that the development of a very-high-temperature zone in novae is more common than previously deduced from visible data alone.
Grasdalen Gary L.
Joyce Richard R.
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