The long-term optical spectral variability of BL Lacertae
I. E. PapadakisIESL – Foundation for Research and Technology, 711 10 Heraklion, GreeceM. VillataINAF – Osservatorio Astronomico di Torino, via Osservatorio 20, 10025 Pino Torinese (TO), ItalyC. M. RaiteriINAF – Osservatorio Astronomico di Torino, via Osservatorio 20, 10025 Pino Torinese (TO), Italy
2007en
ABI
Аннотация
Context.We present the results from a study of the long-term optical spectral variations of BL Lacertae, using the long and well-sampled B and R-band light curves of the Whole Earth Blazar Telescope (WEBT) collaboration, binned in time intervals of 1 day.
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