Stellar twins in RAVE with Gaia : J/MNRAS/472/2517


Authors : Jofre P. orcid , Traven G., Hawkins K. (hide) , Traven G., Hawkins K. et..al

Bibcode : 2017MNRAS.472.2517J (ADS) (Simbad) (Objects) (hide)

CDS Keywords : Clusters, globular; Stars, double and multiple; Parallaxes, trigonometric
UAT : Globular star clusters, Multiple stars, Optical astronomy, Trigonometric parallax

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Inserted into VizieR : 11-Aug-2020
Last modification : 17-Aug-2024

Climbing the cosmic ladder with stellar twins in RAVE with Gaia. (2017)

Keywords : methods statistical - techniques: spectroscopic - stars: distances

Abstract: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 {chi}^2^ 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 ...(more)
Abstract: (hide)
The twin method is applied to determine parallaxes for stars in the RAVE survey. The method is based on the proposition that if two stars have the same spectra (hence twins) they have the same luminosity. By knowing the parallax of one star, we can estimate the parallax of its twin by comparing their magnitudes.

  • I/337 : Gaia DR1 (Gaia Collaboration, 2016)
  • III/279 : RAVE 5th data release (Kunder+, 2017)

                
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