Discovery of stars surrounded by iron dust in the LMC

11 Jan 2019 Marini E. Dell'Agli F. Di Criscienzo M. Puccetti S. García-Hernández D. A. Mattsson L. Ventura P.

We consider a small sample of oxygen-rich, asymptotic giant branch stars in the Large Magellanic Cloud, observed by the Spitzer Space Telescope, exhibiting a peculiar spectral energy distribution, which can be hardly explained by the common assumption that dust around AGB stars is primarily composed of silicate grains. We suggest that this uncommon class of objects are the progeny of a metal-poor generation of stars, with metallicity $Z \sim 1-2\times 10^{-3}$, formed $\sim 100$ Myr ago... (read more)

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