Surface Pollution of Main-sequence Stars through Encounters with Agb Ejecta in Ω Centauri

Abstract

The origin of a double main-sequence (MS) in ω Centauri is explored. We have shown from theoretical calculations on the stellar evolution that the colors of MS stars are shifted to those of the observed blue MS if the surface layers are polluted by He-rich materials with the mass of ∼ 0.1 M⊙. Stars are supposed to be polluted through numerous encounters… (More)

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