CN star

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A CN star is a star with strong cyanogen bands in its spectrum. Cyanogen is a simple molecule of one carbon atom and one nitrogen atom, with absorption bands around 388.9 and 421.6 nm.[1] This group of stars was first noticed by Nancy G. Roman who called them 4150 stars.[2]


  1. ^ Schmitt, John L. (3 June 1970). "Stars with Strong Cyanogen Absorption". Astrophysical Journal. 163: 75. Bibcode:1971ApJ...163...75S. doi:10.1086/150747.
  2. ^ Roman, Nancy G. (1 March 1952). "The Spectra of the Bright Stars of Types F5-K5". Astrophysical Journal. 116: 122. Bibcode:1952ApJ...116..122R. doi:10.1086/145598.