Observations of carbon monoxide in metal-deficient stars

Details Observations of carbon monoxide in metal-deficient stars Observations of carbon monoxide in metal-deficient stars

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..675p&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, Dec. 1978-Jan. 1979, p. 675-678.

Astronomy and Astrophysics

Astronomy

10

Abundance, Carbon Monoxide, Giant Stars, Stellar Spectra, Iron, Late Stars, Spectral Energy Distribution, Spectral Line Width

Scientific paper

A sample of cool metal-deficient giant stars has been observed to obtain an estimate of the CO abundance independent of metallicity. The strength of the 2.3-micron first-overtone carbon monoxide band was measured photometrically using intermediate-bandwidth filters. For late-type giants with Fe/H from about zero to -1.5 the CO index decreases with decreasing metallicity from the mean relation for Population I giants. Stars more metal-poor than Fe/H = -1.5 show uniformly weak or undetectable CO. Among giant stars of intermediate metallicity, the scatter in the observed CO strength as a function of Fe/H may be larger than can be attributed to observational error. A range in the abundance ratio CNO/Fe in metal-poor field giants is suggested.

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