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Chemical separation...
Chemical separation of disc components using RAVE
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- Wojno, Jennifer (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Kordopatis, Georges (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Steinmetz, Matthias (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- McMillan, Paul (author)
- Lund University,Lunds universitet,Astronomi - Har omorganiserats,Institutionen för astronomi och teoretisk fysik - Har omorganiserats,Naturvetenskapliga fakulteten,Lund Observatory - Has been reorganised,Department of Astronomy and Theoretical Physics - Has been reorganised,Faculty of Science,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization
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- Matijevic, Gal (author)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Binney, James (author)
- University of Oxford
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- Wyse, Rosemary F G (author)
- Johns Hopkins University
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- Boeche, Corrado (author)
- Heidelberg University
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- Just, Andreas (author)
- Heidelberg University
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- Grebel, Eva K. (author)
- Heidelberg University
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- Siebert, Arnaud (author)
- University of Strasbourg
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- Bienaym-e, Olivier (author)
- University of Strasbourg
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- Gibson, Brad K. (author)
- University of Hull
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- Zwitter, Tomaz (author)
- University of Ljubljana
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- Bland-Hawthorn, Joss (author)
- University of Sydney
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- Navarro, Julio F. (author)
- University of Victoria
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- Parker, Quentin A. (author)
- University of Hong Kong
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- Reid, Warren (author)
- Macquarie University, Sydney,Western Sydney University
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- Seabroke, George (author)
- University College London
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- Watson, Fred (author)
- Australian Astronomical Observatory
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(creator_code:org_t)
- 2016-07-07
- 2016
- English 10 s.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 461:4, s. 4246-4255
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Abstract
Subject headings
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- We present evidence from the RAdial Velocity Experiment (RAVE) survey of chemically separated, kinematically distinct disc components in the solar neighbourhood.We apply probabilistic chemical selection criteria to separate our sample into a-low ('thin disc') and a-high ('thick disc') sequences. Using newly derived distances,which will be utilized in the upcoming RAVE DR5, we explore the kinematic trends as a function of metallicity for each of the disc components. For our a-low disc, we find a negative trend in the mean rotational velocity (Vf) as a function of iron abundance ([Fe/H]). We measure a positive gradient ∂Vφ/∂[Fe/H] for the a-high disc, consistent with results from high-resolution surveys.We also find differences between the a-low and a-high discs in all three components of velocity dispersion.We discuss the implications of an a-low, metal-rich population originating from the inner Galaxy, where the orbits of these stars have been significantly altered by radial mixing mechanisms in order to bring them into the solar neighbourhood. The probabilistic separation we propose can be extended to other data sets for which the accuracy in [a/Fe] is not sufficient to disentangle the chemical disc components a priori. For such data sets which will also have significant overlap with Gaia DR1, we can therefore make full use of the improved parallax and proper motion data as it becomes available to investigate kinematic trends in these chemical disc components.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Galaxy: abundances
- Galaxy: disc
- Galaxy: evolution
- Galaxy: kinematics and dynamics
- Galaxy: structure
- Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Wojno, Jennifer
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Kordopatis, Geor ...
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Steinmetz, Matth ...
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McMillan, Paul
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Matijevic, Gal
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Binney, James
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show more...
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Wyse, Rosemary F ...
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Boeche, Corrado
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Just, Andreas
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Grebel, Eva K.
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Siebert, Arnaud
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Bienaym-e, Olivi ...
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Gibson, Brad K.
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Zwitter, Tomaz
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Bland-Hawthorn, ...
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Navarro, Julio F ...
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Parker, Quentin ...
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Reid, Warren
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Seabroke, George
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Watson, Fred
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