OBSERVATIONAL PROPERTIES OF THE METAL-POOR THICK DISK OF THE MILKY WAY AND INSIGHTS INTO ITS ORIGINS

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 Radial Velocity Experiment spectroscopic survey of bright stars to differentiate among the present scenarios of the formation of the thick disk. In...

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Bibliographic Details
Published in:The Astrophysical journal 2011-08, Vol.737 (1), p.jQuery1323905062083='48'-jQuery1323905062083='48'
Main Authors: RUCHTI, Gregory R, FULBRIGHT, Jon P, NAVARRO, Juho F, PARKER, Quentin A, REID, Warren, SEABROKE, George M, SIEBERT, Arnaud, SIVIERO, Alessandro, STEINMETZ, Matthias, WATSON, Fred G, WILLIAMS, Mary, ZWITTER, Tomaz, WYSE, Rosemary F. G, GILMORE, Gerard F, BIENAYME, Olivier, BLAND-HAWTHORN, Joss, GIBSON, Brad K, GREBEL, Eva K, HELMI, Amina, MUNARI, Ulisse
Format: Article
Language:English
Subjects:
ABUNDANCE
Acquisitions
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Disks
Dwarf galaxies
Earth, ocean, space
Eccentric orbits
ELEMENT ABUNDANCE
ELEMENTS
EVOLUTION
Exact sciences and technology
GALAXIES
GIANT STARS
IRON
Metallicity
METALS
MILKY WAY
Orbitals
Red giant stars
STAR ACCRETION
STAR EVOLUTION
STARS
TRANSITION ELEMENTS
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Summary: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 Radial Velocity Experiment 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 [ Delta *a/Fe] ratios are enhanced and have little variation (
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/737/1/9