The evolution of asymptotic giant branch stars in the Magellanic Clouds. III - The problem of intermediate-mass stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Asymptotic Giant Branch Stars, Magellanic Clouds, Mass To Light Ratios, Red Giant Stars, Spectrum Analysis, Stellar Evolution, Stellar Mass Ejection, Late Stars, Mira Variables, Radial Velocity

Scientific paper

Two samples of red giants in the LMC with bolometric magnitudes in the interval (-4, -8) are examined spectroscopically. These samples are deficient in luminous stars (Mbol less than -5.5) with any evidence of third dredge-up. A number of explanations are considered, of which the most likely (if standard estimates are correct for the maximum mass star that can become an AGB star) is that stars of 2-5 solar masses spend their thermal pulsing lifetime in a brief Mira phase, and that their evolution is rapidly truncated by depletion of the stellar envelope by mass loss.

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