Carbon monoxide band intensities in M giants

Details Carbon monoxide band intensities in M giants Carbon monoxide band intensities in M giants

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..882m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Nov. 1984, p. 882-890. Research supported by the Ro

Astronomy and Astrophysics

Astronomy

30

Carbon Monoxide, Giant Stars, M Stars, Stellar Spectra, Carbon, Indexes, Infrared Spectrophotometers, Tables (Data)

Scientific paper

The strength of the CO 2.3 μm bands was measured photometrically in an attempt to identify extremely carbon poor M giants. Magnitudes of about 200 bright M stars were obtained through a J filter, and narrow filters centered on 2.17 μm, and 2.40 μm. No M giants with CO indices indicative of extremely low carbon abundances were positively identified. The tight correlation of CO index to effective temperature does not extend to the extremely late and variable M giants. The CO index in M giants defined by the 2.17 μm and 2.40 μm magnitudes was calibrated by a spectrum synthesis technique. The dependence of CO index upon carbon abundance, the 12C/13C ratio, surface gravity, effective temperature, and microturbulent velocity was investigated. Predicted and observed CO indices are in excellent agreement for stars with a spectroscopically determined carbon abundance.

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