stars: late-type; stars: low-mass; stars: fundamental parameters; techniques: interferometric
Abstract :
[en] 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-type stars with enhanced metallicity slightly inflated radii, whereas for stars with decreased metallicity we measure smaller radii. We further show that Gaia DR2 effective temperatures for M-dwarfs are underestimated by ˜ 8.2 per cent and give an empirical M[SUB]G[/SUB]-T[SUB]eff[/SUB] relation which is better suited for M-dwarfs with T[SUB]eff[/SUB] between 2600 and 4000 K. Most importantly, we are able to observationally identify a discontinuity in the T[SUB]eff[/SUB]-radius plane, which is likely due to the transition from partially convective M-dwarfs to the fully convective regime. We found this transition to happen between 3200 K and 3340 K, or equivalently for stars with masses {≈ } 0.23 M_{⊙}. We find that in this transition region the stellar radii are in the range from 0.18 to 0.42 R[SUB]⊙[/SUB] for similar stellar effective temperatures.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rabus, Markus ; Instituto de Astronomía, Facultad de Física, Pontificia Universidad Católica de Chile, casilla 306, Santiago 22, Chile ; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ; Las Cumbres Observatory Global Telescope, 6740 Cortona Dr., Suite 102, Goleta, CA 93111, USA ; Department of Physics, University of California, Santa Barbara, CA 93106-9530, USA
Lachaume, Régis; Instituto de Astronomía, Facultad de Física, Pontificia Universidad Católica de Chile, casilla 306, Santiago 22, Chile ; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
Jordán, Andrés; Instituto de Astronomía, Facultad de Física, Pontificia Universidad Católica de Chile, casilla 306, Santiago 22, Chile ; Millennium Institute for Astrophysics, Chile
Brahm, Rafael; Instituto de Astronomía, Facultad de Física, Pontificia Universidad Católica de Chile, casilla 306, Santiago 22, Chile ; Millennium Institute for Astrophysics, Chile
Boyajian, Tabetha ; Department of Physics and Astronomy, Louisiana State University, 202 Nicholsom Hall, Baton Rouge, LA 70803, USA
von Braun, Kaspar; Lowell Observatory, 1400 W. Mars Hill Road, Flagstaff, AZ 86001, USA
Espinoza, Néstor; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
Berger, Jean-Philippe; Institut de Planétologie et d'Astrophysique de Grenoble, Observatoire de Grenoble, France
Le Bouquin, Jean-Baptiste; Department of Astronomy, University of Michigan, 1085 S. University, Ann Arbor, MI 48109, USA
Absil, Olivier ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Language :
English
Title :
A discontinuity in the Teff-radius relation of M-dwarfs
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