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Improved distances and ages for stars common to TGAS and RAVE

McMillan, Paul J.; Kordopatis, Georges; Kunder, Andrea; Binney, James; Wojno, Jennifer; Zwitter, Tomaž; Steinmetz, Matthias; Bland-Hawthorn, Joss; Gibson, Brad K.; Gilmore, Gerard; Grebel, Eva K.; Helmi, Amina; Munari, Ulisse; Navarro, Julio F.; Parker, Quentin A.; Seabroke, George; Watson, Fred; Wyse, Rosemary F.G.

Authors

Paul J. McMillan

Georges Kordopatis

Andrea Kunder

James Binney

Jennifer Wojno

Tomaž Zwitter

Matthias Steinmetz

Joss Bland-Hawthorn

Gerard Gilmore

Eva K. Grebel

Amina Helmi

Ulisse Munari

Julio F. Navarro

Quentin A. Parker

George Seabroke

Fred Watson

Rosemary F.G. Wyse



Abstract

We combine parallaxes from the first Gaia data release with the spectrophotometric distance estimation framework for stars in the fifth RAVE survey data release. The combined distance estimates are more accurate than either determination in isolation – uncertainties are on average two times smaller than for RAVE-only distances (three times smaller for dwarfs), and 1.4 times smaller than TGAS parallax uncertainties (two times smaller for giants). We are also able to compare the estimates from spectrophotometry to those from Gaia, and use this to assess the reliability of both catalogues and improve our distance estimates. We find that the distances to the lowest log g stars are, on average, overestimated and caution that they may not be reliable. We also find that it is likely that the Gaia random uncertainties are smaller than the reported values. As a by-product we derive ages for the RAVE stars, many with relative uncertainties less than 20 per cent. These results for 219 566 RAVE sources have been made publicly available, and we encourage their use for studies that combine the radial velocities provided by RAVE with the proper motions provided by Gaia. A sample that we believe to be reliable can be found by taking only the stars with the flag notification ‘flag_any=0’.

Journal Article Type Article
Publication Date Jul 11, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 477
Issue 4
Pages 5279-5300
APA6 Citation McMillan, P. J., Kordopatis, G., Kunder, A., Binney, J., Wojno, J., Zwitter, T., …Wyse, R. F. (2018). Improved distances and ages for stars common to TGAS and RAVE. Monthly notices of the Royal Astronomical Society, 477(4), 5279-5300. https://doi.org/10.1093/MNRAS/STY990
DOI https://doi.org/10.1093/MNRAS/STY990
Keywords Methods: statistical; Galaxy: fundamental parameters; Galaxy: kinematics and dynamics; Galaxy: structure
Publisher URL https://academic.oup.com/mnras/article-abstract/477/4/5279/4980952?redirectedFrom=fulltext
Copyright Statement This article has been accepted for publication in MNRAS © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Copyright Statement
This article has been accepted for publication in MNRAS © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.







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