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Discovery of Stars Surrounded by Iron Dust in the Large Magellanic Cloud
Univ Roma Tre, Dipartimento Matemat & Fis, Via Vasca Navale 84, I-00100 Rome, Italy.;Osserv Astron Roma, INAF, Via Frascati 33, I-00077 Monte Porzio Catone, Italy..
IAC, E-38200 Tenerife, Spain.;ULL, Dept Astrofis, E-38206 Tenerife, Spain..
Osserv Astron Roma, INAF, Via Frascati 33, I-00077 Monte Porzio Catone, Italy..
ASI, Via Politecn, I-00133 Rome, Italy..
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2019 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 871, no 1, article id L16Article in journal (Refereed) Published
Abstract [en]

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 hardly be explained by the common assumption that dust around Asymptotic Giant Branch stars is primarily composed of silicate grains. We suggest that this uncommon class of objects is the progeny of a metal-poor generation of stars, with metallicity Z similar to 1-2 x 10(-3), formed similar to 100 Myr ago. The main dust component in the circumstellar envelope is solid iron. In these stars the poor formation of silicates is set by the strong nucleosynthesis experienced at the base of the envelope, which provokes a scarcity of magnesium atoms and water molecules, required for the silicate formation. The importance of the present results to interpret the data from the incoming James Webb Space Telescope is also discussed.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 871, no 1, article id L16
Keywords [en]
Magellanic Clouds, stars: abundances, stars: AGB and post-AGB
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-244118DOI: 10.3847/2041-8213/aafdb0ISI: 000456875600009Scopus ID: 2-s2.0-85062044705OAI: oai:DiVA.org:kth-244118DiVA, id: diva2:1289747
Note

QC 20190219

Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-03-18Bibliographically approved

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