Mass-Radius relation of low-mass stars revisited with the VLTI

Details Mass-Radius relation of low-mass stars revisited with the VLTI Mass-Radius relation of low-mass stars revisited with the VLTI

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..792d&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Astronomy and Astrophysics

Astronomy

1

Astrometric And Interferometric Instruments, Low Luminosity Stars, Subdwarfs, And Brown Dwarfs, Radiative Transfer, Scattering

Scientific paper

We report the measurements of 5 single, low-mass and very low-mass stars angular diameter obtained with VINCI (VLT Interferometer Commissioning Instrument) in 2002 and AMBER (Astronomical Multi-BEam Recombiner) since 2007 on the VLTI array. We determined radii with accuracies of 1 to 5% for low-mass and very low mass stars ranging from M5.5V to K0.5V, thus encompassing a good fraction of the M-R relation for low-mass stars. Those results allow to revisit the current state of mass-radius relation for those objects from which a good agreement with models is shown up to about 0.6-0.7 solar masses. We explore remaining discrepancies in the upper part of the mass-radius relation and point out effects that may be due to stellar metallicity.

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