The optical microvariability and spectral changes of the BL Lacertae object S5 0716+714

Abstract

We monitored the BL Lac object S5 0716+714 in the optical band during October 2008, December 2008 and February 2009 with a best temporal resolution of about 5 minutes in the BVRI bands. Four fast flares were observed with amplitudes ranging from 0.3 to 0.75 mag. The source remained active during the whole monitoring campaign, showing microvariability in all days except for one. The overall variability amplitudes are delta B ~ 0.89 mag, delta V ~ 0.80 mag, delta R ~ 0.73 mag and delta I ~0.51 mag. Typical timescales of microvariability range from 2 to 8 hours. The overall V - R color index ranges from 0.37 to 0.59. Strong bluer- when-brighter chromatism was found on internight timescales. However, different spectral behavior was found on intranight timescales. A possible time lag of ~ 11 mins between B and I bands was found on one night. The shock-in-jet model and geometric effects can be applied to explain the source's intranight behavior.

44 pages, 17 figures, 5 tables, accepted by APJS

References in corpus (12)

• Multi-colour optical monitoring of eight red blazars
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• Optical Intra-day Variability in Blazars
• The optical microvariability and spectral changes of the BL Lacertae object S5 0716+714
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• Radio variability properties for radio sources
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• Optical Monitoring of BL Lacertae Object S5 0716+714 with a Novel Multi-Peak Interference Filter
• Nearly Periodic Fluctuations in the Long Term X-ray Light Curves of the Blazars AO 0235+164 and 1ES 2321+419
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• Optical multi-band observations of BL Lacertae during the outburst of 2005
• A possible disk mechanism for the 23d QPO in Mkn~501

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