A discontinuity in theTeff–radius relation of M-dwarfs

  title={A discontinuity in theTeff–radius relation of M-dwarfs},
  author={Markus Rabus and R{\'e}gis Lachaume and Andr'es Jord'an and Rafael Brahm and Tabetha S. Boyajian and Kaspar von Braun and N{\'e}stor Espinoza and J. P. Berger and Jean-Baptiste Le Bouquin and Olivier Absil},
  journal={Monthly Notices of the Royal Astronomical Society},
We report on 13 new high-precision measurements of stellar diameters for low-mass dwarfs obtained by means of near-infrared long-baseline interferometry with PIONIER at the Very Large Telescope Interferometer. Together with accurate parallaxes from Gaia DR2, these measurements provide precise estimates for their linear radii, effective temperatures, masses, and luminosities. This allows us to refine the effective temperature scale, in particular towards the coolest M-dwarfs. We measure for late… 

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