{
  "id": "2108.04699",
  "version": "v1",
  "published": "2021-08-10T13:58:45.000Z",
  "updated": "2021-08-10T13:58:45.000Z",
  "title": "Intra-day variability of BL Lacertae from 2016 to 2018",
  "authors": [
    "Tian Li",
    "Jianghua Wu",
    "Nankun Meng",
    "Yan Dai",
    "Xiaoyuan Zhang"
  ],
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We monitored BL Lacertae in the B, V, R and I bands for 14 nights during the period of 2016-2018. The source showed significant intraday variability on 12 nights. We performed colour-magnitude analysis and found that the source exhibited bluer-when-brighter chromatism. This bluer-when-brighter behavior is at least partly caused by the larger variation amplitude at shorter wavelength. The variations at different wavelengths are well correlated and show no inter-band time lag.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-08-10T13:58:45.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "intra-day variability",
      "source showed significant intraday variability",
      "larger variation amplitude",
      "inter-band time lag",
      "wavelength"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}