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- W2158919461 abstract "The obscured OH/IR star IRAS 05298-6957 in the LMC was recently noticed to be member of the small double cluster HS 327 that also contains a carbon star (van Loon, et al. [CITE], A& A, 329, 169). Hence they are coeval and have (nearly) the same progenitor mass, which can only be understood if Hot Bottom Burning (HBB) has prevented IRAS 05298-6957 from being a carbon star. We present extensive visual and near-IR photometric data for > 104 stars in and around HS 327, and spectroscopic data for some of the brightest AGB stars amongst these. Colour-magnitude diagrams are used to estimate the age for the cluster and its members, and luminosities are derived for the stars for which spectra have been obtained. The age for IRAS 05298-6957 and the carbon star is estimated to be ∼ 200 Myr. This corresponds to a Main-Sequence progenitor mass ∼4.0 -the first direct measurement of the lower mass threshold for HBB. This agrees with stellar evolution models that, however, fail to reproduce the low luminosity of the carbon star." @default.
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- W2158919461 date "2001-03-01" @default.
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- W2158919461 title "The peculiar cluster HS 327 in the Large Magellanic Cloud: Can OH/IR stars and carbon stars be twins?" @default.
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- W2158919461 doi "https://doi.org/10.1051/0004-6361:20000529" @default.
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