Correlations between statistical population indices and spectral characteristics of carbon stars |
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Authors: | Janina Krempeć |
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Institution: | (1) Astronomical Institute, Astrophysics Laboratory, Polish Academy of Sciences, Toru , Poland |
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Abstract: | The coefficients of correlation between spectroscopic data published by Yamashita (1967) and others for carbon stars and the statistical population indices calculated for these stars at the Toru Observatory are calculated (Table II). The intensity estimates of Cai 4227 Å, Nai D lines, the C13/C12 ratio, then=n(Li/Ca) index, as well as CN and probably C2 bands are higher in population I carbon stars. The CH(G) band and probably hydrogen (H , H , H ) lines as well as Baii ![lambda](/content/n6g38x3051121901/xxlarge955.gif) 4554 and 4934 Å lines are stronger in population II carbon stars. The photoelectric colour indices, corrected for interstellar reddening do not show significant population effects. They can be used as spectral type equivalents. For a population criterion the CH/CN intensity ratio is proposed. |
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