{
  "id": "1805.03236",
  "version": "v1",
  "published": "2018-05-08T19:13:08.000Z",
  "updated": "2018-05-08T19:13:08.000Z",
  "title": "An Ultraviolet-Optical Color-Metallicity relation for Red Clump Stars using GALEX and Gaia",
  "authors": [
    "Steven Mohammed",
    "David Schiminovich",
    "Keith Hawkins",
    "Benjamin Johnson",
    "Dun Wang",
    "David W. Hogg"
  ],
  "comment": "8 pages, 9 figures, 1 table, submitted to ApJ",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "Although core helium-burning red clump (RC) stars are faint at ultraviolet wavelengths, their ultraviolet-optical color is a unique and accessible probe of their physical properties. Using data from the GALEX All Sky Imaging Survey, Gaia Data Release 2 and the SDSS APOGEE DR14 survey, we find that spectroscopic metallicity is strongly correlated with the location of an RC star in the UV-optical color magnitude diagram. The RC has a wide spread in (NUV - G)$_0$ color, over 4 magnitudes, compared to a 0.7-magnitude range in (G$_{BP}$ - G$_{RP}$)$_0$. We propose a photometric, dust-corrected, ultraviolet-optical (NUV - G)$_0$ color-metallicity [Fe/H] relation using a sample of 5,175 RC stars from APOGEE. We show that this relation has a scatter of 0.28 dex and is easier to obtain for large, wide-field samples than spectroscopic metallicities. Importantly, the effect may be comparable to the spread in RC color attributed to extinction in other studies.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-05-08T19:13:08.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "red clump stars",
      "ultraviolet-optical color-metallicity relation",
      "sdss apogee dr14 survey",
      "rc star",
      "spectroscopic metallicity"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}