The evolution of asymptotic giant branch stars in the Large Magellanic Cloud. II - Spectroscopy of a complete sample

Details The evolution of asymptotic giant branch stars in the Large Magellanic Cloud. II - Spectroscopy of a complete sample The evolution of asymptotic giant branch stars in the Large Magellanic Cloud. II - Spectroscopy of a complete sample

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..236r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 1, 1985, p. 236-254.

Astronomy and Astrophysics

Astrophysics

35

Asymptotic Giant Branch Stars, Giant Stars, Late Stars, Magellanic Clouds, Stellar Evolution, Stellar Spectra, Radial Velocity, Stellar Luminosity, Stellar Mass Ejection, Stellar Spectrophotometry

Scientific paper

Spectra of 113 asymptotic giant branch (AGB) star candidates constituting six magnitude-limited, area-complete samples in the outer regions of the northern LMC have been obtained. Luminosity functions constructed from these data are well represented by an underlying intermediate-mass AGB population, the product of continuous star formation over the last 3-4 Gyr, supplemented in some areas by more massive red giant and supergiant stars, with a typical age of about 10 to the 8th yr. Most stars with Mbol between -5 and -5.5 show evidence for dredge-up of s-process elements, as do a smaller proportion in the range Mbol between -4.5 and -5. Only 10 percent of the sample, however, are C stars, and these are concentrated toward the Bar of the LMC. No evidence has been found for envelope burning in any of the stars in the sample.

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