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- W2148547933 abstract "We have undertaken the study of the elemental abundances and kinematic properties of a metal-poor sample of candidate thick-disk stars selected from the RAVE spectroscopic survey of bright stars to differentiate among the present scenarios of the formation of the thick disk. In this paper, we report on a sample of 214 red giant branch, 31 red clump/horizontal branch, and 74 main-sequence/sub-giant branch metal-poor stars, which serves to augment our previous sample of only giant stars. We find that the thick disk [alpha/Fe] ratios are enhanced, and have little variation (<0.1 dex), in agreement with our previous study. The augmented sample further allows, for the first time, investigation of the gradients in the metal-poor thick disk. For stars with [Fe/H] < -1.2, the thick disk shows very small gradients, <0.03 +/- 0.02 dex/kpc, in alpha-enhancement, while we find a +0.01 +/- 0.04 dex/kpc radial gradient and a -0.09 +/- 0.05 dex/kpc vertical gradient in iron abundance. In addition, we show that the peak of the distribution of orbital eccentricities for our sample agrees better with models in which the stars that comprise the thick disk were formed primarily in the Galaxy, with direct accretion of stars contributing little. Our results thus disfavor direct accretion of stars from dwarf galaxies into the thick disk as a major contributor to the thick disk population, but cannot discriminate between alternative models for the thick disk, such as those that invoke high-redshift (gas-rich) mergers, heating of a pre-existing thin stellar disk by a minor merger, or efficient radial migration of stars." @default.
- W2148547933 created "2016-06-24" @default.
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- W2148547933 date "2011-07-21" @default.
- W2148547933 modified "2023-10-10" @default.
- W2148547933 title "OBSERVATIONAL PROPERTIES OF THE METAL-POOR THICK DISK OF THE MILKY WAY AND INSIGHTS INTO ITS ORIGINS" @default.
- W2148547933 cites W1490864757 @default.
- W2148547933 cites W1569860697 @default.
- W2148547933 cites W1845039355 @default.
- W2148547933 cites W1967911932 @default.
- W2148547933 cites W1973411103 @default.
- W2148547933 cites W1976255645 @default.
- W2148547933 cites W1976555052 @default.
- W2148547933 cites W1980935497 @default.
- W2148547933 cites W1984603026 @default.
- W2148547933 cites W1989442665 @default.
- W2148547933 cites W1994166266 @default.
- W2148547933 cites W1999645097 @default.
- W2148547933 cites W2011490256 @default.
- W2148547933 cites W2014925718 @default.
- W2148547933 cites W2016734711 @default.
- W2148547933 cites W2020951456 @default.
- W2148547933 cites W2027501458 @default.
- W2148547933 cites W2029384527 @default.
- W2148547933 cites W2036949958 @default.
- W2148547933 cites W2039452097 @default.
- W2148547933 cites W2041542911 @default.
- W2148547933 cites W2046939760 @default.
- W2148547933 cites W2048570620 @default.
- W2148547933 cites W2050790396 @default.
- W2148547933 cites W2058614050 @default.
- W2148547933 cites W2060195076 @default.
- W2148547933 cites W2062281103 @default.
- W2148547933 cites W2062513796 @default.
- W2148547933 cites W2068488209 @default.
- W2148547933 cites W2073488875 @default.
- W2148547933 cites W2077495516 @default.
- W2148547933 cites W2088913565 @default.
- W2148547933 cites W2092358536 @default.
- W2148547933 cites W2092826856 @default.
- W2148547933 cites W2099299102 @default.
- W2148547933 cites W2100032934 @default.
- W2148547933 cites W2101922294 @default.
- W2148547933 cites W2102486049 @default.
- W2148547933 cites W2108855404 @default.
- W2148547933 cites W2110253451 @default.
- W2148547933 cites W2111817932 @default.
- W2148547933 cites W2124201251 @default.
- W2148547933 cites W2124294611 @default.
- W2148547933 cites W2125174497 @default.
- W2148547933 cites W2126794554 @default.
- W2148547933 cites W2134167138 @default.
- W2148547933 cites W2135461819 @default.
- W2148547933 cites W2136597776 @default.
- W2148547933 cites W2141314742 @default.
- W2148547933 cites W2142471547 @default.
- W2148547933 cites W2142824603 @default.
- W2148547933 cites W2160168093 @default.
- W2148547933 cites W2160299852 @default.
- W2148547933 cites W2161558319 @default.
- W2148547933 cites W2237029308 @default.
- W2148547933 cites W2604557582 @default.
- W2148547933 cites W3100127245 @default.
- W2148547933 cites W3100838532 @default.
- W2148547933 cites W3101515212 @default.
- W2148547933 cites W3101602967 @default.
- W2148547933 cites W3101737156 @default.
- W2148547933 cites W3102669749 @default.
- W2148547933 cites W3103864864 @default.
- W2148547933 cites W3103947064 @default.
- W2148547933 cites W3104150871 @default.
- W2148547933 cites W3104375564 @default.
- W2148547933 cites W3105251865 @default.
- W2148547933 cites W3105274712 @default.
- W2148547933 cites W3105685335 @default.
- W2148547933 cites W3122137891 @default.
- W2148547933 cites W3124077099 @default.
- W2148547933 cites W3124597791 @default.
- W2148547933 cites W4293199123 @default.