• Seven-Year Multi-Colour Optical Monitoring of BL Lacertae Object S5 0716+714

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    • Keywords


      Active; galaxy; photometry.

    • Abstract


      We monitored the BL Lac object S5 0716+714 in five intermediate optical passbands from 2004 September to 2011 April. The object was active most of the time and intra-day variability was frequently observed. The total variation amplitude tended to decrease with decreasing frequency. Strong bluer-when-brighter chromatism was observed on both long and short timescales.

    • Author Affiliations


      Jianghua Wu1 Yan Dai2 Xu Zhou3 Jun Ma3

      1. Department of Astronomy, Beijing Normal University, Beijing 100875, China.
      2. Department for Popularization of Astronomy, Beijing Planetarium, Beijing 100044, China.
      3. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China.
    • Dates

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