{
  "id": "1904.02714",
  "version": "v1",
  "published": "2019-04-04T18:00:00.000Z",
  "updated": "2019-04-04T18:00:00.000Z",
  "title": "The dependence of convective core overshooting on stellar mass: reality check, and additional evidence",
  "authors": [
    "Antonio Claret",
    "Guillermo Torres"
  ],
  "comment": "14 pages in emulateapj format, including figures and tables. Accepted for publication in The Astrophysical Journal",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Overshooting from the convective cores of stars more massive than about 1.2 M(Sun) has a profound impact on their subsequent evolution. And yet, the formulation of the overshooting mechanism in current stellar evolution models has a free parameter (f[ov] in the diffusive approximation) that remains poorly constrained by observations, affecting the determination of astrophysically important quantities such as stellar ages. In an earlier series of papers we assembled a sample of 37 well-measured detached eclipsing binaries to calibrate the dependence of f[ov] on stellar mass, showing that it increases sharply up to a mass of roughly 2 M(Sun), and remains constant thereafter out to at least 4.4 M(Sun). Recent claims have challenged the utility of eclipsing binaries for this purpose, on the basis that the uncertainties in f[ov] from the model fits are typically too large to be useful, casting doubt on a dependence of overshooting on mass. Here we reexamine those claims and show them to be too pessimistic, mainly because they did not account for all available constraints --- both observational and theoretical --- in assessing the true uncertainties. We also take the opportunity to add semi-empirical f[ov] determinations for 14 additional binaries to our previous sample, and to update the values for 8 others. All are consistent with, and strengthen our previous conclusions, supporting a dependence of f[ov] on mass that is now based on estimates for a total of 51 binary systems (102 stars).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-04-04T18:00:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "stellar mass",
      "convective core overshooting",
      "additional evidence",
      "reality check",
      "dependence"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}