Correlations Between Statistical Population Indices and Spectral Characteristics of Carbon Stars

Details Correlations Between Statistical Population Indices and Spectral Characteristics of Carbon Stars Correlations Between Statistical Population Indices and Spectral Characteristics of Carbon Stars

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970ap%26ss...6..131k&link_type=abstract

Astrophysics and Space Science, Volume 6, Issue 1, pp.131-140

Astronomy and Astrophysics

Astrophysics

6

Scientific paper

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 Toruń Observatory are calculated (Table II). The intensity estimates of Ca i λ4227 Å, Na i 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 (Hβ, Hγ, Hδ) lines as well as Ba ii λλ4554 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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