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Carbon monoxide band intensities in M giants
The strength of CO (2.3 micron) bands was measured using the photometercomponent of the Kitt Peak 1.3-m telescope in an attempt to identifyextremely carbon-poor M giants. Magnitudes for about 200 bright M starswere obtained through a J filter, and narrow filters were centered on2.17 and 2.40 microns, respectively. No M giants were found with COindices indicative of extremely low carbon abundances. The correlationof CO index to effective temperature did not extend to the extremelylate and variable M giants. The dependence of CO index upon carbonabundance, 12-C/13-C ratio, surface gravity, effective temperature, andmicroturbulent velocity indices were also investigated. It is found thatthe predicted and observed CO indices are in good agreement for starswith spectroscopically determined carbon abundance.
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Osservazione e dati astrometrici
| Costellazione: | Pesci |
| Ascensione retta: | 00h31m10.22s |
| Declinazione: | +16°26'25.2" |
| Magnitudine apparente: | 8.845 |
| Moto proprio RA: | 29.5 |
| Moto proprio Dec: | 3 |
| B-T magnitude: | 9.21 |
| V-T magnitude: | 8.876 |
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