{
  "id": "2101.04429",
  "version": "v1",
  "published": "2021-01-12T12:02:00.000Z",
  "updated": "2021-01-12T12:02:00.000Z",
  "title": "Magnetic-buoyancy-induced mixing in AGB Stars: a theoretical explanation of the non-universal [Y/Mg]-age relation",
  "authors": [
    "Magrini L.",
    "Vescovi D.",
    "Casali G.",
    "Cristallo S.",
    "Viscasillas Vazquez C.",
    "Cescutti G.",
    "Spina L.",
    "Van Der Swaelmen M.",
    "Randich S"
  ],
  "comment": "Accepted for publication as an A&A Letter",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "The use of abundance ratios involving Y, or other slow-neutron capture elements, are routinely used to infer stellar ages.Aims.We aim to explain the observed [Y/H] and [Y/Mg] abundance ratios of star clusters located in the inner disc with a new prescription for mixing in Asymptotic Giant Branch (AGB) stars. In a Galactic chemical evolution model, we adopt a new set of AGB stellar yields in which magnetic mixing is included. We compare the results of the model with a sample of abundances and ages of open clusters located at different Galactocentric distances. The magnetic mixing causes a less efficient production of Y at high metallicity. A non-negligible fraction of stars with super-solar metallicity is produced in the inner disc, and their Y abundances are affected by the reduced yields. The results of the new AGB model qualitatively reproduce the observed trends for both [Y/H] and [Y/Mg] vs age at different Galactocetric distances. Our results confirm from a theoretical point of view that the relationship between [Y/Mg] and stellar age cannot be universal, i.e., the same in every part of the Galaxy. It has a strong dependence on the star formation rate, on the s-process yields and their relation with metallicity, and thus it varies across the Galactic disc.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-01-12T12:02:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "agb stars",
      "theoretical explanation",
      "magnetic-buoyancy-induced mixing",
      "abundance ratios",
      "non-universal"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}