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• W3104619951 abstract "Since their discovery, cosmic crystalline silicates have presented several challenges to understanding dust formation and evolution. The mid-infrared spectrum of IRAS 17495–2534, a highly obscured oxygen-rich asymptotic giant branch (AGB) star, is the only source observed to date which exhibits a clear crystalline silicate absorption feature. This provides an unprecedented opportunity to test competing hypotheses for dust formation. Observed spectral features suggest that both amorphous and crystalline dust is dominated by forsterite (Mg2SiO4) rather than enstatite (MgSiO3) or other silicate compositions. We confirm that high mass-loss rates should produce more crystalline material, and show why this should be dominated by forsterite. The presence of Mg2SiO4 glass suggests that another factor (possibly C/O) is critical in determining astromineralogy. Correlation between crystallinity, mass-loss rate, and initial stellar mass suggests that only the most massive AGB stars contribute significant quantities of crystalline material to the interstellar medium, resolving the conundrum of its low crystallinity." @default.
• W3104619951 created "2020-11-23" @default.
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• W3104619951 date "2008-10-08" @default.
• W3104619951 modified "2023-09-23" @default.
• W3104619951 title "The Cosmic Crystallinity Conundrum: Clues from IRAS 17495-2534" @default.
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• W3104619951 doi "https://doi.org/10.1086/593302" @default.
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