The Optical Microvariability and Spectral Changes of the BL Lacertae Object S5 0716+714 |
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| Authors: | H Poon J H Fan J N Fu |
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| Institution: | 1. Astronomy Department, Beijing Normal University, Beijing, 100875, China
2. Center for Astrophysics, Guangzhou University, Guangzhou, 510006, China
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| Abstract: | The BL Lac object S5 0716+714 was monitored in the optical band during October 2008, December 2008 and February 2009. We achieved a best temporal resolution of about 5 min in the BVRI bands. The source was active during the whole monitoring campaign. It showed microvariability in 13 days out of 14 days of observation. Four fast flares were observed with amplitudes ranging from 0.3–0.75 mag. The overall amplitude changes during the whole campaign are ΔB ~ 0. m 89, ΔV ~ 0. m 80, ΔR ~ 0. m 73, and ΔI ~ 0. m 51. On internight time scales, strong bluer-when-brighter chromatism was found while different spectral behaviours were found on intranight time scales. |
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