CO overtone emission from Magellanic Cloud supergiants

Details CO overtone emission from Magellanic Cloud supergiants CO overtone emission from Magellanic Cloud supergiants

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..639m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 639-656.

Astronomy and Astrophysics

Astrophysics

78

Carbon Monoxide, Emission Spectra, Magellanic Clouds, Stellar Spectrophotometry, Supergiant Stars, Absorption Spectra, Early Stars, Stellar Envelopes, Stellar Luminosity

Scientific paper

CO first-overtone emission at 2.3 μm has been detected in six luminous emission-line stars in the Large Magellanic Cloud. Of these, HD 268835, Hen S12, and HD 38489 are B[e] stars, HD 37836 is a peculiar O supergiant, and HD 269953 and HD 269723 are G supergiants. CO overtone emission is therefore present in luminous stars with a very large range of effective temperatures. Circumstellar disks are required around the three B[e] CO emission stars and HD 37836 to account for their optical and ultraviolet spectra. The CO overtone emission is also likely to arise in these disks because disk densities can be high enough to collisionally excite CO overtone emission and shield the CO gas from direct stellar radiation.

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