{
  "id": "1601.05054",
  "version": "v1",
  "published": "2016-01-19T19:58:26.000Z",
  "updated": "2016-01-19T19:58:26.000Z",
  "title": "Correlation between lithium abundances and ages of solar twin stars",
  "authors": [
    "Marilia Carlos",
    "Poul E. Nissen",
    "Jorge Melendez"
  ],
  "comment": "6 pages and 6 figures. Submitted to Astronomy & Astrophysics",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We want to determine the lithium abundances of solar twin stars as a function of stellar age to provide constraints for stellar evolutions models and to investigate whether there is a connection between low Li abundance and the occurrence of planets. For a sample of 21 solar twins observed with the HARPS spectrograph at high spectral resolution (R~115.000) and very high signal-to-noise ratio (600 < S/N < 2400), precise lithium abundances were obtained by spectral synthesis of the LiI 6707.8 A line and compared to stellar ages, masses, and metallicities determined from a spectroscopic analysis of the same set of HARPS spectra. We show that for the large majority of the solar twins there is a strong correlation between lithium abundance and stellar age. As the age increases from 1 to 9 Gyr, the Li abundance decreases by a factor of ~ 50. The relation agrees fairly well with predictions from non-standard stellar evolution models of Li destruction at the bottom of the upper convection zone. Two stars deviate from the relation by having Li abundances enhanced by a factor of ~ 10, which may be due to planet engulfment. On the other hand, we find no indication of a link between planet hosting stars and enhanced lithium depletion.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-01-19T19:58:26.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "solar twin stars",
      "stellar age",
      "correlation",
      "non-standard stellar evolution models",
      "upper convection zone"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}