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Title:
Metallicity of M dwarfs. II. A comparative study of photometric metallicity scales
Authors:
Neves, V.; Bonfils, X.; Santos, N. C.; Delfosse, X.; Forveille, T.; Allard, F.; Natário, C.; Fernandes, C. S.; Udry, S.
Affiliation:
AA(Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal; UJF-Grenoble 1 / CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal), AB(UJF-Grenoble 1 / CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France), AC(Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal), AD(UJF-Grenoble 1 / CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France), AE(UJF-Grenoble 1 / CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, 38041, Grenoble, France), AF(Centre de Recherche Astrophysique de Lyon, UMR 5574: CNRS, Université de Lyon, École Normale Supérieure de Lyon, 46 Allée d'Italie, 69364, Lyon Cedex 07, France), AG(Centro de Astronomia e Astrofísica da Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016, Lisboa, Portugal; Leiden Observatory, Leiden University, The Netherlands), AH(Centro de Astronomia e Astrofísica da Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016, Lisboa, Portugal), AI(Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290, Sauverny, Switzerland)
Publication:
Astronomy & Astrophysics, Volume 538, id.A25 (A&A Homepage)
Publication Date:
02/2012
Origin:
EDP Sciences
Astronomy Keywords:
stars: late-type, stars: fundamental parameters, binaries: general, planetary systems, stars: atmospheres
DOI:
10.1051/0004-6361/201118115
Bibliographic Code:
2012A&A...538A..25N

Abstract

Stellar parameters are not easily derived from M dwarf spectra, which are dominated by complex bands of diatomic and triatomic molecules and do not agree well with the individual line predictions of atmospheric models. M dwarf metallicities are therefore most commonly derived through less direct techniques. Several recent publications propose calibrations that provide the metallicity of an M dwarf from its Ks band absolute magnitude and its V - Ks color, but disagree at the ±0.1 dex level. We compared these calibrations using a sample of 23 M dwarfs, which we selected as wide (>5 arcsec) companions of F-, G-, or K-dwarfs with metallicities measured on a homogeneous scale and which we require to have V band photometry measured to better than ~0.03 mag. We find that the Schlaufman & Laughlin (2010, A&A, 519, A105) calibration has the lowest offsets and residuals against our sample, and used our improved statistics to marginally refine that calibration. With more strictly selected photometry than in previous studies, the dispersion around the calibration is well in excess of the [Fe/H] and photometric uncertainties. This suggests that the origin of the remaining dispersion is astrophysical rather than observational.

Based on observations collected with the FEROS spectrograph at la Silla observatory under ESO programs 073.D-0802(A), 074.D-0670(A), 078.D-0760(A), and with the ELODIE and SOPHIE spectrographs at the Observatoire de Haute Provence.

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