Name of the Speaker(s): Enrico MASSARO
Institution: Istituto Astronomico, Universita' La Sapienza, via G. M. Lancisi 29, I-00161 ROMA (Italy)
Title of the communication: Narrow Band Photometry between 700 and 1000 nm of some bright BL Lac objects.
E. Massaro, M.Maesano, F. Montagni, R. Nesci and F. D' Alessio
Preliminary abstract (12 lines max.): We present the results of a narrow band photometric research program in the wavelength interval 700-1000 nm, started at the beginning of 1996. The main goal of this project is the study of the changes of the continuum spectral distribution of some bright BL Lac objects in different luminosty states. The filters used are those of the 13 colours Arizona photometric system, and, in the interval under considerations have the effective wavelengths of 720, 800, 860, and 980 nm.