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- W3100433192 endingPage "98" @default.
- W3100433192 startingPage "98" @default.
- W3100433192 abstract "We examine the mid-infrared fluxes and spectral energy distributions for metal-poor stars with iron abundances [Fe/H] $lesssim-5$, as well as two CEMP-no stars, to eliminate the possibility that their low metallicities are related to the depletion of elements onto dust grains in the formation of a debris disk. Six out of seven stars examined here show no mid-IR excess. These non-detections rule out many types of circumstellar disks, e.g. a warm debris disk ($T!le!290$ K), or debris disks with inner radii $le1$ AU, such as those associated with the chemically peculiar post-AGB spectroscopic binaries and RV Tau variables. However, we cannot rule out cooler debris disks, nor those with lower flux ratios to their host stars due to, e.g. a smaller disk mass, a larger inner disk radius, an absence of small grains, or even a multicomponent structure, as often found with the chemically peculiar Lambda Bootis stars. The only exception is HE0107-5240, for which a small mid-IR excess near 10 microns is detected at the 2-$sigma$ level; if the excess is real and associated with this star, it may indicate the presence of (recent) dust-gas winnowing or a binary system." @default.
- W3100433192 created "2020-11-23" @default.
- W3100433192 creator A5020600710 @default.
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- W3100433192 date "2014-08-01" @default.
- W3100433192 modified "2023-10-10" @default.
- W3100433192 title "SEARCHING FOR DUST AROUND HYPER METAL POOR STARS" @default.
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- W3100433192 doi "https://doi.org/10.1088/0004-637x/791/2/98" @default.
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