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Metal abundances and ages for some Magellanic Cloud variable stars
Butler, D.; Demarque, P.; Smith, H. A.
AA(Yale University Observatory, New Haven, CT), AB(Yale University Observatory, New Haven, CT)
Astrophysical Journal, Part 1, vol. 257, June 15, 1982, p. 592-602. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Abundance, Magellanic Clouds, Stellar Evolution, Variable Stars, Chemical Evolution, Main Sequence Stars, Metals, Milky Way Galaxy, Stellar Atmospheres, Stellar Luminosity, Stellar Magnitude, Stellar Structure
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The Delta-S metal abundance parameter, pulsation mass, and evolutionary age have been determined for 15 Magellanic Cloud field variable stars. It is found that the central region of the SMC is only now reaching the degree of chemical enrichment which the Galaxy attained 10-billion years ago. Both the LMC and SMC contain an old, metal-poor population of halo stars, just as the Galaxy does. In sharp contrast to the case for the Galaxy, however, much of the total SMC chemical enrichment has taken place within the past few billion years. The situation for the LMC is less clear, but the data are not inconsistent with a chemical evolution history similar to that for the SMC.

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