Poster Open Access

The metallicity of M dwarfs: photometric calibrations with Markov Chain Monte Carlo and Bayesian inference

Duque-Arribas, Christian; Montes, David; Tabernero, Hugo M.; Marfil, Emilio; Caballero, Jose Antonio


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    <subfield code="a">The metallicity of M dwarfs: photometric calibrations with Markov Chain Monte Carlo and Bayesian inference</subfield>
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    <subfield code="a">&lt;p&gt;In our on-going effort to characterize M dwarfs, we have carried out multi-band photometry calibrations of metallicity for early and intermediate M dwarfs using Gaia EDR3, 2MASS and AllWISE. These catalogs, combined with a sample of 5435 M dwarfs with additional parameters determined by APOGEE high-resolution spectroscopy, allow us to study the effect of the chemical composition in color-color and color-magnitude diagrams. We train the calibrations using Bayesian statistics and Markov Chain Monte Carlo (MCMC) techniques and derive several photometric calibrations aplicable to M dwarfs with metallicities of -0.4 &amp;le; [Fe/H] &amp;le; +0.4, obtaining estimations reliable to 0.10 dex. Lastly, we compare our results with previous photometric studies of metallicity for an additional sample of FGK+M common-proper-motion systems, finding a great predictive performance.&lt;/p&gt;</subfield>
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