{
  "id": "1406.6127",
  "version": "v2",
  "published": "2014-06-24T02:54:06.000Z",
  "updated": "2014-07-11T18:58:37.000Z",
  "title": "Metallicity of M dwarfs IV. A high-precision [Fe/H] and Teff technique from high-resolution optical spectra for M dwarfs",
  "authors": [
    "V. Neves",
    "X. Bonfils",
    "N. C. Santos",
    "X. Delfosse",
    "T. Forveille",
    "F. Allard",
    "S. Udry"
  ],
  "comment": "Accepted in Astronomy and Astrophysics. Updated one important reference in the introduction. Some typos corrected",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Aims. In this work we develop a technique to obtain high precision determinations of both metallicity and effective temperature of M dwarfs in the optical. Methods. A new method is presented that makes use of the information of 4104 lines in the 530-690 nm spectral region. It consists in the measurement of pseudo equivalent widths and their correlation with established scales of [Fe/H] and $T_{eff}$. Results. Our technique achieves a $rms$ of 0.08$\\pm$0.01 for [Fe/H], 91$\\pm$13 K for $T_{eff}$, and is valid in the (-0.85, 0.26 dex), (2800, 4100 K), and (M0.0, M5.0) intervals for [Fe/H], $T_{eff}$ and spectral type respectively. We also calculated the RMSE$_{V}$ which estimates uncertainties of the order of 0.12 dex for the metallicity and of 293 K for the effective temperature. The technique has an activity limit and should only be used for stars with $\\log{L_{H_{\\alpha}}/L_{bol}} < -4.0$. Our method is available online at \\url{http://www.astro.up.pt/resources/mcal}.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2014-07-11T18:58:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high-resolution optical spectra",
      "teff technique",
      "metallicity",
      "high-precision",
      "pseudo equivalent widths"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201424139",
      "journal": "Astronomy and Astrophysics",
      "year": 2014,
      "month": "Aug",
      "volume": 568
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014A&A...568A.121N"
    }
  }
}