Climbing the cosmic ladder with stellar twins in RAVE with Gaia

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift


We apply the twin method to determine parallaxes to 232 545 stars of the RAVE survey using the parallaxes of Gaia DR1 as a reference. To search for twins in this large data set, we apply the t-student stochastic neighbour embedding projection that distributes the data according to their spectral morphology on a two-dimensional map. From this map, we choose the twin candidates for which we calculate a χ2 to select the best sets of twins. Our results show a competitive performance when compared to other model-dependent methods relying on stellar parameters and isochrones. The power of the method is shown by finding that the accuracy of our results is not significantly affected if the stars are normal or peculiar since the method is model free. We find twins for 60 per cent of the RAVE sample that are not contained in Tycho-Gaia Astrometric Solution (TGAS) or that have TGAS uncertainties that are larger than 20 per cent. We could determine parallaxes with typical errors of 28 per cent. We provide a complementary data set for the RAVE stars not covered by TGAS, or that have TGAS uncertainties which are larger than 20 per cent, with model-free parallaxes scaled to the Gaia measurements.


  • P. Jofré
  • G. Traven
  • K. Hawkins
  • G. Gilmore
  • J. L. Sanders
  • T. Mädler
  • M. Steinmetz
  • A. Kunder
  • G. Kordopatis
  • P. McMillan
  • O. Bienaymé
  • J. Bland-Hawthorn
  • B. K. Gibson
  • E. K. Grebel
  • U. Munari
  • J. E. J. Garcia Navarro
  • Q. A. Parker
  • W. A. Reid
  • G. Seabroke
  • T. Zwitter
Enheter & grupper
Externa organisationer
  • University of Cambridge
  • University of Ljubljana
  • Columbia University
  • Leibniz Institute for Astrophysics Potsdam (AIP)
  • Côte d'Azur Observatory
  • University of Strasbourg
  • University of Sydney
  • Heidelberg University
  • University of Padova
  • University of Victoria
  • University of Hong Kong
  • Macquarie University, Sydney
  • Western Sydney University
  • University College London
  • Diego Portales University
  • University of Hull

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Astronomi, astrofysik och kosmologi


Sidor (från-till)2517-2533
Antal sidor17
TidskriftMonthly Notices of the Royal Astronomical Society
StatusPublished - 2017
Peer review utfördJa