{
  "id": "2208.12969",
  "version": "v1",
  "published": "2022-08-27T09:29:20.000Z",
  "updated": "2022-08-27T09:29:20.000Z",
  "title": "Change in spin-down rate and detection of emission line in HMXB 4U 2206+54 with AstroSat observation",
  "authors": [
    "Chetana Jain",
    "Ajay Yadav",
    "Rahul Sharma"
  ],
  "comment": "Accepted in Journal of Astrophysics and Astronomy",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "This work presents timing and spectral analysis of 4U 2206+54 using data obtained from LAXPC instrument onboard India's AstroSat mission. This source was observed with AstroSat in September 2016 and October 2016. We report detection of $5648 (4)$ s pulsations at MJD 57669 in the latter observation of 4U 2206+54. The pulse profile is sinusoidal and the inherent shape is independent of energy up to 30 keV. The pulse fraction increases with energy from $\\sim 0.5$% to $\\sim 0.8$%. We report an updated spin down rate of $2.95 (14) \\times 10^{-7}$ s s$^{-1}$. This is about 0.40 times smaller than the previously reported long term value. The energy spectrum is best modelled with an absorbed power-law with high energy exponential cut-off. We have detected presence of broad emission line in 4U 2206+54 at an energy of $7$ keV with equivalent width of $\\sim 0.4$ keV.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-08-27T09:29:20.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "emission line",
      "hmxb 4u",
      "astrosat observation",
      "spin-down rate",
      "laxpc instrument onboard indias astrosat"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}