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- W3100111554 abstract "We present 838 ab-type RR Lyrae stars from the Lowell Observatory Near Earth Objects Survey Phase I (LONEOS-I). These objects cover 1430 deg2 and span distances ranging from 3 to 30 kpc from the Galactic center. Object selection is based on phased, photometric data with 28-50 epochs. We use this large sample to explore the bulk properties of the stellar halo, including the spatial distribution. The period-amplitude distribution of this sample shows that the majority of these RR Lyrae stars resemble Oosterhoff type I, but there is a significant fraction (26%) which have longer periods and appear to be Oosterhoff type II. We find that the radial distributions of these two populations have significantly different profiles (ρOoI ∼ R−2.26 ± 0.07 and ρOoII ∼ R−2.88 ± 0.11). This suggests that the stellar halo was formed by at least two distinct accretion processes and supports dual-halo models." @default.
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- W3100111554 date "2008-05-10" @default.
- W3100111554 modified "2023-09-28" @default.
- W3100111554 title "Evidence for Distinct Components of the Galactic Stellar Halo from 838 RR Lyrae Stars Discovered in the LONEOS‐I Survey" @default.
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- W3100111554 doi "https://doi.org/10.1086/533484" @default.
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