Improved distances and ages for stars common to TGAS and RAVE

McMillan, Paul J.Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science (author)

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 aremore 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'.

Kordopatis, GeorgesCôte d'Azur Observatory (author)
Kunder, AndreaLeibniz Institute for Astrophysics Potsdam (AIP) (author)
Binney, JamesUniversity of Oxford (author)
Wojno, JenniferJohns Hopkins University,Leibniz Institute for Astrophysics Potsdam (AIP) (author)
Zwitter, TomažUniversity of Ljubljana (author)
Steinmetz, MatthiasLeibniz Institute for Astrophysics Potsdam (AIP) (author)
Bland-Hawthorn, JossUniversity of Sydney (author)
Gibson, Brad K.University of Hull (author)
Gilmore, GerardUniversity of Cambridge (author)
Grebel, Eva K.Heidelberg University (author)
Helmi, AminaUniversity of Groningen (author)
Munari, UlisseINAF - Osservatorio Astronomico di Padova (author)
Navarro, Julio F.University of Victoria (author)
Parker, Quentin A.University of Hong Kong (author)
Seabroke, GeorgeUniversity College London (author)
Watson, FredAustralian Astronomical Observatory (author)
Wyse, Rosemary F.G.Johns Hopkins University (author)
Astronomi - Genomgår omorganisationInstitutionen för astronomi och teoretisk fysik - Genomgår omorganisation (creator_code:org_t)

In:Monthly Notices of the Royal Astronomical Society477:4, s. 5279-53000035-8711

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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