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

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dc.creatorBonfils, X.
dc.creatorDelfosse, X.
dc.creatorUdry, S.
dc.creatorSantos, N. C.
dc.creatorForveille, T.
dc.creatorSégransan, D.
dc.date2005-03-11
dc.date2005-07-22
dc.date.accessioned2026-07-07T02:17:12Z
dc.date.available2026-07-07T02:17:12Z
dc.descriptionWe 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 represents a breakthrough in a field where discussions have had to remain largely qualitative, and it helps us demonstrate that metallicity explains most of the large dispersion in the empirical V-band mass-luminosity relation. We examine the metallicity of the two known M-dwarf planet-host stars, Gl 876 (+0.02 dex) and Gl 436 (-0.03 dex), in the context of preferential planet formation around metal-rich stars. We finally determine the metallicity of the 47 brightest single M dwarfs in a volume limited sample, and compare the metallicity distributions of solar-type and M-dwarf stars in the solar neighbourhood.
dc.descriptionfinal version, accepted for publication (A&A)
dc.identifierhttps://arxiv.org/abs/astro-ph/0503260
dc.identifierhttp://arxiv.org/abs/astro-ph/0503260
dc.identifierdoi:10.1051/0004-6361:20053046
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9085
dc.subjectAstrophysics
dc.titleMetallicity of M dwarfs I. A photometric calibration and impact on the mass-luminosity relation at the bottom of the main sequence
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