Metallicity of M dwarfs - I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence

@article{Bonfils2005MetallicityOM,
  title={Metallicity of M dwarfs - I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence},
  author={Xavier Bonfils and Xavier Delfosse and St{\'e}phane Udry and Nuno C. Santos and Thierry Forveille and Damien S'egransan},
  journal={Astronomy and Astrophysics},
  year={2005},
  volume={442},
  pages={635-642}
}
We obtained high resolution ELODIE and CORALIE spectra for both components of 20 wide visual binaries composed of an F-, G- or K-dwarf primary and an M-dwarf secondary. We analyse the well-understood spectra of the primaries to determine metallicities ([Fe/H]) for these 20 systems, and hence for their M dwarf components. We pool these metallicities with determinations from the literature to obtain a precise ( ± 0.2 dex) photometric calibration of M dwarf metallicities. This calibration… 

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