Carbon Isotope Ratios from the First Overtone CO Bands in Metal-Poor Giants.

Details Carbon Isotope Ratios from the First Overtone CO Bands in Metal-Poor Giants. Carbon Isotope Ratios from the First Overtone CO Bands in Metal-Poor Giants.

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114..819p&link_type=abstract

Astronomical Journal v.114, p. 819-824 (1997)

Astronomy and Astrophysics

Astronomy

19

Stars: Low-Mass, Stars: Abundances, Stars: Evolution

Scientific paper

We report observations of the first overtone bands of (12) CO and (13) CO using the high resolution, infrared spectrometer Phoenix to determine carbon isotope ratios in field metal poor giant stars. The isotope ratios we have determined are in good agreement with previous work using blue CH and red CN features. Carbon isotope ratios in metal poor stars appear to decline abruptly to very low values at log g =~ 2 on the first ascent of the giant branch. The decline is consistent with the onset of mixing of the convective envelope into the hydrogen burning shell. Evidence for a continuing decline in the isotope ratio with increasing luminosity in metal poor giants from log g = 2 to log g = 0 is weak, but such a decline cannot be ruled out.

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