{
  "id": "1810.07480",
  "version": "v1",
  "published": "2018-10-17T11:22:43.000Z",
  "updated": "2018-10-17T11:22:43.000Z",
  "title": "Probing stellar evolution with S stars and Gaia",
  "authors": [
    "Shreeya Shetye",
    "Sophie Van Eck",
    "Alain Jorissen",
    "Hans Van Winckel",
    "Lionel Siess",
    "Stephane Goriely"
  ],
  "comment": "Proceedings IAU Symposium No. 343: Why galaxies care about AGB stars?, 2018",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "S-type stars are late-type giants enhanced with s-process elements originating either from nucleosynthesis during the Asymptotic Giant Branch (AGB) or from a pollution by a binary companion. The former are called intrinsic S stars, and the latter extrinsic S stars. The intrinsic S stars are on the AGB and have undergone third dredge-up events. The atmospheric parameters of S stars are more numerous than those of M-type giants (C/O ratio and s-process abundances affect the thermal structure and spectral synthesis), and hence they are more difficult to derive. These atmospheric parameters are also entangled within each other. Nevertheless, high-resolution spectroscopic data of S stars combined with the Gaia Data Release 2 (GDR2) parallaxes and with the MARCS model atmospheres for S-type stars were used to derive effective temperatures, surface gravities, and luminosities. These parameters not only allow to locate the intrinsic and extrinsic S stars in the Hertzsprung-Russell (HR) diagram but also allow the accurate abundance analysis of the s-process elements.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-10-17T11:22:43.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "probing stellar evolution",
      "s-type stars",
      "s-process elements",
      "undergone third dredge-up events",
      "atmospheric parameters"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}