{
  "id": "2309.01402",
  "version": "v1",
  "published": "2023-09-04T07:12:03.000Z",
  "updated": "2023-09-04T07:12:03.000Z",
  "title": "NLTE analysis for Y I and Y II in atmospheres of F-G-K stars",
  "authors": [
    "Sofya Alexeeva",
    "Yu Wang",
    "Gang Zhao",
    "Feng Wang",
    "Yong Wu",
    "Jianguo Wang",
    "Hongliang Yan",
    "Jianrong Shi"
  ],
  "comment": "13 figures, 8 tables, accepted to ApJ",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "The non-local thermodynamical equilibrium (NLTE) line formation of Y I and Y II is considered in 1D LTE model atmospheres of F-G-K-type stars. The model atom was constructed with the most up-to-date atomic data, including quantum cross sections and rate coefficients for transitions in inelastic collisions of Y I and Y II with hydrogen atoms. For seven reference stars, we obtained an agreement between NLTE abundances inferred from the two ionization stages, while the difference in LTE abundance (Y I - Y II) can reach up to -0.31 dex. In the atmospheres of F-G-K-type stars, for both Y I and Y II lines, the NLTE abundance corrections are positive. In solar metallicity stars, the NLTE abundance corrections for Y II lines do not exceed 0.12 dex, while in atmospheres of metal-poor stars they do not exceed 0.21 dex. For Y I lines, the NLTE abundance corrections can reach up to 0.5 dex. We determined the yttrium NLTE abundances for a sample of 65 F and G dwarfs and subgiants in the -2.62~$\\leq$~[Fe/H]~$\\leq$~+0.24 metallicity range, using high-resolution spectra. For stars with [Fe/H]~$\\leq$~-1.5, [Y/Fe] versus [Fe/H] diagram reveals positive trend with an average value of [Y/Fe]~$\\simeq$~0. For metal-poor stars, among Sr, Y, and Zr, the arrangement [Sr/Fe] < [Y/Fe] < [Zr/Fe] remains consistent. The current study is useful for the Galactic chemical evolution research. The model atom will be applied for NLTE yttrium abundance determination in very metal-poor stars studied with LAMOST and Subaru.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-09-04T07:12:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "nlte abundance corrections",
      "f-g-k stars",
      "nlte analysis",
      "metal-poor stars",
      "f-g-k-type stars"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}