{
  "id": "2110.10700",
  "version": "v1",
  "published": "2021-10-20T18:00:10.000Z",
  "updated": "2021-10-20T18:00:10.000Z",
  "title": "CAPOS: The bulge Cluster APOgee Survey III. Spectroscopic Tomography of Tonantzintla 2",
  "authors": [
    "José G. Fernández-Trincado",
    "Sandro Villanova",
    "Doug Geisler",
    "Beatriz Barbuy",
    "Dante Minniti",
    "Timothy C. Beers",
    "Szabolcs Mészáros",
    "Baitian Tang",
    "Roger E. Cohen",
    "Cristian Moni Bidin",
    "Elisa R. Garro",
    "Ian Baeza",
    "Cesar Muñoz"
  ],
  "comment": "Accepted for publication in A&A; 12 pages, 9 figures, 2 tables. arXiv admin note: text overlap with arXiv:2106.00027",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "(ABRIDGED) We have performed the first detailed spectral analysis of red giant members of the relatively high-metallicity globular cluster (GC) Tononzintla~2 (Ton~2) using high-resolution near-infrared spectra collected with the Apache Point Observatory Galactic Evolution Experiment II survey (APOGEE-2), obtained as part of the bulge Cluster APOgee Survey. We investigate chemical abundances for a variety of species including the light-, odd-Z, $\\alpha$-, Fe-peak, and neutron-capture elements from high S/N spectra of seven giant members. The derived mean cluster metallicity is [Fe/H]$=-0.70\\pm0.05$, with no evidence for an intrinsic metallicity spread. Ton~2 exhibits a typical $\\alpha$-enrichment that follows the trend for high-metallicity Galactic GCs, similar to that seen in 47~Tucanae and NGC~6380. We find a significant nitrogen spread ($>0.87$ dex), and a large fraction of nitrogen-enriched stars that populate the cluster. Given the relatively high-metallicity of Ton~2, these nitrogen-enriched stars are well above the typical Galactic levels, indicating the prevalence of the multiple-population phenomenon in this cluster which also contains several stars with typical low, first-generation N abundances. We also identify the presence of [Ce/Fe] abundance spread in Ton~2, which is correlated with the nitrogen enhancement, indicating that the \\textit{s}-process enrichment in this cluster has been produced likely by relatively low-mass Asymptotic Giant Branch stars. Furthermore, we find a mean radial velocity of the cluster, $-178.6\\pm0.86$ km s$^{-1}$ with a small velocity dispersion, 2.99$\\pm$0.61 km s$^{-1}$, which is typical of a GC. We also find a prograde bulge-like orbit for Ton~2 that appears to be radial and highly eccentric.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-10-20T18:00:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "bulge cluster apogee survey",
      "observatory galactic evolution experiment",
      "point observatory galactic evolution",
      "spectroscopic tomography",
      "low-mass asymptotic giant branch stars"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}