Skip to main content

Research Repository

Advanced Search

Chemical separation of disc components using RAVE

Wojno, Jennifer; Kordopatis, Georges; Steinmetz, Matthias; McMillan, Paul; Matijevič, Gal; Binney, James; Wyse, Rosemary F. G.; Boeche, Corrado; Just, Andreas; Grebel, Eva K.; Siebert, Arnaud; Bienaymé, Olivier; Gibson, Brad K.; Zwitter, Tomaž; Bland-Hawthorn, Joss; Navarro, Julio F.; Parker, Quentin A.; Reid, Warren; Seabroke, George; Watson, Fred

Authors

Jennifer Wojno

Georges Kordopatis

Matthias Steinmetz

Paul McMillan

Gal Matijevič

James Binney

Rosemary F. G. Wyse

Corrado Boeche

Andreas Just

Eva K. Grebel

Arnaud Siebert

Olivier Bienaymé

Brad K. Gibson

Tomaž Zwitter

Joss Bland-Hawthorn

Julio F. Navarro

Quentin A. Parker

Warren Reid

George Seabroke

Fred Watson



Abstract

© 2016 The Authors. 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.

Citation

Wojno, J., Kordopatis, G., Steinmetz, M., McMillan, P., Matijevič, G., Binney, J., …Watson, F. (2016). Chemical separation of disc components using RAVE. Monthly notices of the Royal Astronomical Society, 461(4), 4246-4255. https://doi.org/10.1093/mnras/stw1633

Acceptance Date Jul 5, 2016
Online Publication Date Jul 7, 2016
Publication Date Oct 1, 2016
Deposit Date Dec 6, 2017
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 461
Issue 4
Pages 4246-4255
DOI https://doi.org/10.1093/mnras/stw1633
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL https://hull-repository.worktribe.com/output/496731
Publisher URL https://academic.oup.com/mnras/article/461/4/4246/2608747

Files

Article.pdf (1.1 Mb)
PDF

Copyright Statement
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society







You might also like



Downloadable Citations