Photometric monitoring of 12 BL Lacertae objects |
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| Authors: | GZ Xie SB Zhou BZ Dai EW Liang KH Li JM Bai SY Xing WW Liu |
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| Institution: | 1Yunnan Astronomical Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, China;2National Astronomical Observatories, Chinese Academy of Sciences, China;3United Laboratory of Optical Astronomy, Chinese Academy of Sciences, China;4Yunnan Astrophysics Center, Yunnan University, Kunming 650091, China;5Physics Department, Guangxi University, Nanning, Guangxi 530004, China |
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| Abstract: | We present the results of our monitoring the flux variability of 12 BL Lac objects, which have variabilities on time-scales ranging from hours to months. Individual sources are discussed in detail. Three of them, OY091,  and  , show significant rapid variation (hours). Two of them, 3C 66A and Mrk 501, exhibit significant variability on time-scales of months. We find that 3C 66A has a variability period of  , supporting the 65-d period obtained by Lainela et al. The periodicity seems to be weak according to the Jurkevich  test. We also find a correlation between  colour index and B magnitude for Mrk 421. We discuss possible physical mechanisms on the basis of these observational phenomena. |
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| Keywords: | galaxies: active BL Lacertae objects: general galaxies: jets galaxies: nuclei galaxies: photometry gamma-rays: observations |
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