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The metallicity adopted is $Z=3*10^{-4} (which, with an alpha-enhancement of +0.4, corresponds to [Fe/H]=-2). Dust formation is described by following the growth of dust grains of various types as the wind expands from the stellar surface.\n  Models with mass M>3Msun experience Hot Bottom Burning, thus maintaining the surface C/O below unity. 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The metallicity adopted is $Z=3*10^{-4} (which, with an alpha-enhancement of +0.4, corresponds to [Fe/H]=-2). Dust formation is described by following the growth of dust grains of various types as the wind expands from the stellar surface.\n  Models with mass M>3Msun experience Hot Bottom Burning, thus maintaining the surface C/O below unity. 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