Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..350...71b&link_type=abstract
Blazar Variability Workshop II: Entering the GLAST Era ASP Conference Series, Vol. 350, Proceedings of the Conference Held 10-12
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Broad band BVRI (Johnson-Cousins) observations of BL Lac were done as part of the optical WEBT 2000 monitoring Campaign extension at the OAN-SPM. sing the 1.5m telescope we observed intraday variations in B,V,R filters in July 27th, 28th and 30th (UT). In particular, we detect variations in B˜ 0.133± 0.029 mag, V ˜ 0.147± 0.035 mag, and R ˜ 0.114± 0.020 mag from 27th to 28th nights, and B ˜ 0.199± 0.021 mag, V˜ 0.141± 0.030 mag, and R ˜ 0.167 ± 0.074 mag from 28th to 30th nights. Intraday variations show that that BL Lac was getting fainter each night. Optical microvariations were also detected in the three nights, with a maximum change of Δ R = 0.147 ± 0.020 mag in Δ{t} = 2.5 hrs. We also observed that the maximum spectral changes obtained with the three filters were: ΔαBV˜ 1.8, ΔαVR˜ 1.12 and ΔαBR˜ 0.57. From ΔαBR we find that the object is redder-when-fainter as has been found in previous studies. However, when using V filter, we observed that the spectrum becomes flatter (ΔαBV) from July 27th to 28th and also from ΔαVR from July 28th to 30th. Our results led us to conclude that the source is not bluer nor redder-when fainter.
Observatorio Astronómico Nacional, at San Pedro Mártir Baja California, México.
Benitez Erika
Ramirez Alba
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