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- W1676625384 abstract "We derive calcium abundances for two classes of A stars that show direct or indirect evidence for the presence of circumstellar (CS) gas and/or dust: λ Boo stars and A stars with infrared excesses. We argue that λ Boo stars are pre-main-sequence objects, and that Vega also belongs to this class. By contrast, the surface composition of other A stars with dust disks, including s PiC., is surprisingly normal. In λ Boo stars a correlation exists between the deficiency of dust-phase elements, stellar rotation, and surface gravity, suggesting that the surface anomaly develops during the final contraction towards the ZAMS, and that the rotation rate decreases rather than increases during this phase." @default.
- W1676625384 created "2016-06-24" @default.
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- W1676625384 date "1996-01-01" @default.
- W1676625384 modified "2023-09-23" @default.
- W1676625384 title "Lambda Bootis Stars and ‘Dusty’ A Stars" @default.
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- W1676625384 doi "https://doi.org/10.1007/978-3-540-68594-4_38" @default.
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