Carbon isotopic ratios in giant stars in the globular clusters M4 and M22

Details Carbon isotopic ratios in giant stars in the globular clusters M4 and M22 Carbon isotopic ratios in giant stars in the globular clusters M4 and M22

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1699s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1699-1707. Research supported by the Robert A. Welch Foundation.

Astronomy and Astrophysics

Astronomy

67

Abundance, Astronomical Spectroscopy, Carbon Isotopes, Giant Stars, Globular Clusters, G Stars, Infrared Spectra, K Stars, Metallicity, Spectral Line Width

Scientific paper

The abundances of C-12 and C-13 have been determined for seven stars in the globular cluster M4 and five stars in M22. The analysis utilizes low-resolution IR spectra, obtained with the KPNO-FTS, of the first-overtone vibration-rotation (V-R) bands of CO near a wavelength of 2.3 microns. This resolution is sufficient to resolve the individual V-R bands of C-12O and C-13O. Spectrum synthesis was used to derive individual carbon-12 and -13 abundances. This method of using low-resoluion spectra to obtain abundances was tested by deriving C-isotopic abundances in ten G and K giants that have been studied at high resolution by previous investigators: good agreement is found between the low- and high-resolution analyses. The globular cluster giants, in general, exhibit very low C-12/C-13 ratios, with most having C-12/C-13 of less than 10. Results suggest that those low-mass, low-metallicity giants have undergone extensive mixing of CN-processed material into their atmospheres. These results are compared to previous analyses of both metal-poor field giants and globular cluster giants, and discussed in terms of deep mixing in these stars.

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