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Chemical separation of disc components using RAVE

Wojno, Jennifer; Kordopatis, Georges; Steinmetz, Matthias; McMillan, Paul LU ; Matijevic, Gal; Binney, James; Wyse, Rosemary F G; Boeche, Corrado; Just, Andreas and Grebel, Eva K., et al. (2016) In Monthly Notices of the Royal Astronomical Society 461(4). p.4246-4255
Abstract

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... (More)

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.

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published
subject
keywords
Galaxy: abundances, Galaxy: disc, Galaxy: evolution, Galaxy: kinematics and dynamics, Galaxy: structure
in
Monthly Notices of the Royal Astronomical Society
volume
461
issue
4
pages
10 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:84988615457
  • wos:000383514900069
ISSN
0035-8711
DOI
10.1093/mnras/stw1633
language
English
LU publication?
yes
id
f08c298a-5838-4232-bd47-75a07e732e8e
date added to LUP
2016-10-28 10:40:12
date last changed
2017-09-17 09:30:43
@article{f08c298a-5838-4232-bd47-75a07e732e8e,
  abstract     = {<p>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.</p>},
  author       = {Wojno, Jennifer and Kordopatis, Georges and Steinmetz, Matthias and McMillan, Paul and Matijevic, Gal and Binney, James and Wyse, Rosemary F G and Boeche, Corrado and Just, Andreas and Grebel, Eva K. and Siebert, Arnaud and Bienaym-e, Olivier and Gibson, Brad K. and Zwitter, Tomaz and Bland-Hawthorn, Joss and Navarro, Julio F. and Parker, Quentin A. and Reid, Warren and Seabroke, George and Watson, Fred},
  issn         = {0035-8711},
  keyword      = {Galaxy: abundances,Galaxy: disc,Galaxy: evolution,Galaxy: kinematics and dynamics,Galaxy: structure},
  language     = {eng},
  month        = {10},
  number       = {4},
  pages        = {4246--4255},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {Chemical separation of disc components using RAVE},
  url          = {http://dx.doi.org/10.1093/mnras/stw1633},
  volume       = {461},
  year         = {2016},
}