Other
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..195m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 1, 1987, p. 195-202.
Other
11
Astronomical Spectroscopy, Carbon Monoxide, Magellanic Clouds, Molecular Spectra, Stellar Spectra, Supergiant Stars, Abundance, Forbidden Transitions, Late Stars, Stellar Atmospheres, Stellar Models
Scientific paper
Theoretical 2.3 microns first-overtone CO indices are presented for a range of supergiant model atmospheres. The CO index is shown to be very sensitive to microturbulent velocity. The larger CO indices observed for galactic supergiants relative to giants can be understood if the mean microturbulent velocity in supergiants is only about 1 km/sec larger than in giants. The weaker CO indices for Large Magellanic Cloud supergiants, relative to similar stars in the Galaxy, are consistent with an overall metal abundance deficiency of a factor of about 3 in the LMC. The weaker CO indices for supergiants in the small Magellanic Cloud cluster NGC 330 cannot be easily understood by an overall abundance deficiency in these stars of a factor of 10. Either a forbidden A/H ratio of about -1.5 or -1.0 and a forbidden C/A ratio of about -0.5 is suggested to explain the small CO indices for these SMC stars. Much lower microturbulent velocities in the NGC 330 supergiants compared to the other supergiants is a further possibility.
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