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CCD photometry of five X-ray selected BL Lacertae objects |
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| Authors: | L. Ma G. Z. Xie T. F. Yi S. B. Zhou K. H. Li X. Zhang H. Dai |
| Affiliation: | 1. Department of Physics, Yunnan Normal University, Kunming, 650092, P.R. China 2. National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, 650011, P.R. China 3. Department of Physics, Yunnan University, Kunming, 650091, P.R. China |
| Abstract: | We present the results of the monitoring of a sample of 5 HBLs in the B, V and R bands during 2003–2008. All sources in our monitoring project show significant rapid optical variations, except 1ES 1959+650, however; for 1ES 1959+650, the gamma-ray variability on a timescale of ～7 hours has been observed by Holder et al. (Astrophys. J. 583:L9, 2003). Using these variability timescales, we estimate the black hole masses for each source with the Kerr black hole theory. |
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