{
  "id": "0911.5514",
  "version": "v1",
  "published": "2009-11-29T21:04:36.000Z",
  "updated": "2009-11-29T21:04:36.000Z",
  "title": "The Stellar Population of h and chi Persei: Cluster Properties, Membership, and the Intrinsic Colors and Temperatures of Stars",
  "authors": [
    "Thayne Currie",
    "Jesus Hernandez",
    "Jonathan Irwin",
    "Scott J. Kenyon",
    "Susan Tokarz",
    "Zoltan Balog",
    "Ann Bragg",
    "Perry Berlind",
    "Mike Calkins"
  ],
  "comment": "88 pages, many figures, Accepted for publication in The Astrophysical Journal Supplements. Contact lead author for version with high-resolution figures",
  "categories": [
    "astro-ph.SR",
    "astro-ph.EP"
  ],
  "abstract": "(Abridged) From photometric observations of $\\sim$ 47,000 stars and spectroscopy of $\\sim$ 11,000 stars, we describe the first extensive study of the stellar population of the famous Double Cluster, h and $\\chi$ Persei, down to subsolar masses. Both clusters have E(B-V) $\\sim$ 0.52--0.55 and dM = 11.8--11.85; the halo population, while more poorly constrained, likely has identical properties. As determined from the main sequence turnoff, the luminosity of M supergiants, and pre-main sequence isochrones, ages for h Persei, $\\chi$ Persei and the halo population all converge on $\\approx$ 14 Myr. From these data, we establish the first spectroscopic and photometric membership lists of cluster stars down to early/mid M dwarfs. At minimum, there are $\\sim$ 5,000 members within 10' of the cluster centers, while the entire h and $\\chi$ Persei region has at least $\\sim$ 13,000 and as many as 20,000 members. The Double Cluster contains $\\approx$ 8,400 M$_{\\odot}$ of stars within 10' of the cluster centers. We estimate a total mass of at least 20,000 M$_{\\odot}$. We conclude our study by outlining outstanding questions regarding the properties of h and $\\chi$ Persei. From comparing recent work, we compile a list of intrinsic colors and derive a new effective temperature scale for O--M dwarfs, giants, and supergiants.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-11-29T21:04:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "stellar population",
      "intrinsic colors",
      "chi persei",
      "cluster properties",
      "cluster centers"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0067-0049/186/2/191",
      "journal": "The Astrophysical Journal Supplement Series",
      "year": 2010,
      "month": "Feb",
      "volume": 186,
      "number": 2,
      "pages": 191
    },
    "note": {
      "typesetting": "TeX",
      "pages": 88,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 838374,
      "adsabs": "2010ApJS..186..191C"
    }
  }
}