Abstract
WE have been monitoring the 2- and 3-µm spectral regions of Nova Cygni 1975 at irregular intervals. Shortly after maximum, these spectral regions were dominated by the lines of hydrogen and a few of neutral helium superposed on a continuum presumably of free–free radiation. These spectra could be quantitatively interpreted on traditional recombination theory1, assuming a temperature of ∼ 104 K. Beginning with a spectrum obtained on September 29, 1975 a number of additional lines have appeared in the spectrum. These new lines have increased in strength so that in our most recent data they nearly dominate these spectral regions. These two phases of the spectral development of Nova Cygni 1975 are illustrated for the 2- and 3-µm spectral regions in Figs 1 and 2.
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GRASDALEN, G., JOYCE, R. Coronal lines in near infrared spectrum of Nova Cygni 1975. Nature 259, 187–189 (1976). https://doi.org/10.1038/259187a0
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DOI: https://doi.org/10.1038/259187a0
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