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Evolution of optical spectral index and variability properties of S5 0716+714 |
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| Authors: | Jian-Ming Hao Bai-Juan Wang Ze-Jun Jiang Ben-Zhong Dai |
| Institution: | Jian-Ming Hao 1,2,Bai-Juan Wang 1,3,Ze-Jun Jiang 1 , Ben-Zhong Dai 1 1 Department of Physics,Yunnan University,Kunming 650091,China,2 Department of Physics,Yunnan Normal University,Kunming 650092,China 3 Yunnan Agricultural University,Kunming 650201 |
| Abstract: | We analyze the spectral variability and spectral evolution in the optical energy region by using multiband (BVRI) optical observations of S5 0716+714 spanning 1994 to 2005. The spectrum hardens when the source becomes brighter, which is consistent with general BL Lac objects. The spectral evolution parameter implies that the spectral variability is small in optical bands over 10 years. A simple model representing the variability of a synchrotron component can explain the spectral changes. In addition, we em... |
| Keywords: | BL Lacertae objects general-galaxies active-BL Lacertae objects individual (S5 0716+714) |
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