{
  "id": "2208.03404",
  "version": "v1",
  "published": "2022-08-05T23:26:38.000Z",
  "updated": "2022-08-05T23:26:38.000Z",
  "title": "Zwicky Transient Facility and Globular Clusters: The Period-Luminosity and Period-Wesenheit Relations for Type II Cepheids",
  "authors": [
    "Chow-Choong Ngeow",
    "Anupam Bhardwaj",
    "Jing-Yi Henderson",
    "Matthew J. Graham",
    "Russ R. Laher",
    "Michael S. Medford",
    "Josiah Purdum",
    "Ben Rusholme"
  ],
  "comment": "14 pages, 8 Figures and 5 Tables, AJ accepted",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "We present the first gri-band period-luminosity (PL) and period-Wesenheit (PW) relations for 37 Type II Cepheids (hereafter TIIC) located in 18 globular clusters based on photometric data from the Zwicky Transient Facility. We also updated BV IJHK-band absolute magnitudes for 58 TIIC in 24 globular clusters using the latest homogeneous distances to the globular clusters. The slopes of g/r/i and B/V/I band PL relations are found to be statistically consistent when using the same sample of distance and reddening. We employed the calibration of ri-band PL/PW relations in globular clusters to estimate a distance to M31 based on a sample of ~270 TIIC from the PAndromeda project. The distance modulus to M31, obtained using calibrated ri-band PW relation, agrees well with the recent determination based on classical Cepheids. However, distance moduli derived using the calibrated r- and i-band PL relations are systematically smaller by ~0.2 mag, suggesting there are possible additional systematic error on the PL relations. Finally, we also derive the period-color (PC) relations and for the first time the period-Q-index (PQ) relations, where the Q-index is reddening-free, for our sample of TIIC. The PC relations based on (r-i) and near-infrared colors and the PQ relations are found to be relatively independent of the pulsation periods.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-08-05T23:26:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "globular clusters",
      "zwicky transient facility",
      "period-wesenheit relations",
      "period-luminosity",
      "updated bv ijhk-band absolute magnitudes"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}