Origins of the thick disk as traced by the alpha elements of metal-poor giant stars selected from RAVE
Ruchti, Gregory R; Fulbright, J.P.; Wyse, Rosemary F G; Gilmore, Gerard; Bienayme, O; Binney, J; Bland-Hawthorn, Joss; Campbell, R; Freeman, Kenneth; Gibson, Bradley K; Grebel, E.; Helmi, Amina; Munari, U; Navarro, J F; Parker, Quentin A; Reid, W; Steinmetz, Matthias; Watson, Fred G
Theories of thick-disk formation can be differentiated by measurements of stellar elemental abundances. We have undertaken a study of metal-poor stars selected from the RAVE spectroscopic survey of bright stars to establish whether or not there is a significant population of metal-poor thick-disk stars ([Fe/H] ≲ -1.0) and to measure their elemental abundances. In this Letter, we present abundances of four α-elements (Mg, Si, Ca, and Ti) and iron for a subsample of 212 red giant branch and 31...[Show more]
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