Broadband Optical Observations of BL Lacertae during the 1997 Outburst
J. R. WebbDepartment of Physics, Florida International University, Miami, FL 33199, and the SARA ObservatoryIan FreedmanDepartment of Physics, Florida International University, Miami, FL 33199, and the SARA ObservatoryEmily HowardDepartment of Physics, Florida International University, Miami, FL 33199, and the SARA ObservatoryFeng MaDepartment of Astronomy, RLM 15.308, University of Texas at Austin, Austin, TX 78712M. BelfortDepartment of Physics, Florida International University, Miami, FL 33199, and the SARA ObservatoryH. A. RaveDepartment of Physics, Florida International University, Miami, FL 33199, and the SARA ObservatoryK. S. RumstayDepartment of Physics, Astronomy, and Geosciences, Valdosta State University, Valdosta, GA 31698; and the SARA ObservatorySusan NicolDepartment of Physics, Astronomy, and Geosciences, Valdosta State University, Valdosta, GA 31698; and the SARA ObservatoryJessica KrickDepartment of Physics, Astronomy, and Geosciences, Valdosta State University, Valdosta, GA 31698; and the SARA ObservatoryT. D. OswaltAstronomy Group, Department of Physics and Space Sciences, Florida Institute of Technology, Melbourne, FL 32901-6988; and the SARA ObservatoryDaniel MarshallAstronomy Group, Department of Physics and Space Sciences, Florida Institute of Technology, Melbourne, FL 32901-6988; and the SARA ObservatoryTimothy RobishawAstronomy Group, Department of Physics and Space Sciences, Florida Institute of Technology, Melbourne, FL 32901-6988; and the SARA Observatory
1998en
ABI
Annotatsiya
We present BVRI observations of BL Lacertae during its recent outburst. These observations, made during a 3 month period, cover a significant portion of the optical flare. The reduced data are displayed as light curves and broadband spectra. Changes in the spectral index are analyzed, and the results are compared with previous BL Lac observations. We find that the variations are simultaneous in the optical bands, but the higher frequency bands show a higher amplitude of variability. The spectral index is variable during the active period, and there is marginal evidence that the spectrum flattens as the source gets brighter.
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