{
  "id": "1908.01573",
  "version": "v1",
  "published": "2019-08-05T12:05:17.000Z",
  "updated": "2019-08-05T12:05:17.000Z",
  "title": "Detection of White Dwarf Companions to Blue Straggler Stars from UVIT Observations of M67",
  "authors": [
    "Sindhu N",
    "Annapurni Subramaniam",
    "Aaron M Geller",
    "Vikrant Jadhav",
    "Christian Knigge",
    "Mirko Simunovic",
    "Nathan Leigh",
    "Michael Shara",
    "Thomas H Puzia"
  ],
  "comment": "4 pages, 2 figures, to appear in IAU Symposium No. 351 proceedings - Star Clusters: From the Milky Way to the Early Universe, 2019",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "We investigate the old open cluster M67 using ultraviolet photometric data of Ultra-Violet Imaging Telescope in multi-filter far-UV bands. M67, well known for the presence of several blue straggler stars (BSS), has been put to detailed tests to understand their formation pathways. Currently, there are three accepted formation channels: mass transfer due to Roche-lobe overflow in binary systems, stellar mergers either due to dynamical collisions or through coalescence of close binaries. So far, there had not been any confirmed detection of a white dwarf (WD) companion to any of the BSSs in this cluster. Here, we present the detection of WD companions to 5 bright BSSs in M67. The multiwavelength spectral energy distributions covering 0.12 -11.5 $\\mu$m range, were found to require binary spectral fits for 5 BSSs, consisting of a cool (BSS) and a hot companion. The parameters (Luminosity, Temperature, Radius and Mass) of the hot companions suggest them to be WDs with mass in the range 0.2 - 0.35 M$_{\\odot}$ with T$_{eff}$ $\\sim$ 11000 - 24000 K.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-08-05T12:05:17.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "blue straggler stars",
      "white dwarf companions",
      "uvit observations",
      "spectral energy distributions covering",
      "hot companion"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}