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Optical Short-Term Variability in the X-Ray-Selected BL Lac Object IE 0317+186 and the Radio-Selected BL Lac Object ON231

Published online by Cambridge University Press:  07 August 2017

F.Z. Cheng ,
J.F. Lu ,
G.Z. Xie ,
K.H. Li ,
Z.L. Li  and
L.F. Wang
F.Z. Cheng
Affiliation:
Center of Astronomy and Astrophysics, CCAST(World Lab.) Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui, P.R.China
J.F. Lu
Affiliation:
Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui, P.R.China
G.Z. Xie
Affiliation:
Center of Astronomy and Astrophysics, CCAST(World Lab.) Yunnan Observatory, Academia Sinica, Kunming, Yunnan, P.R. China
K.H. Li
Affiliation:
Yunnan Observatory, Academia Sinica, Kunming, Yunnan, P.R. China
Z.L. Li
Affiliation:
Yunnan Observatory, Academia Sinica, Kunming, Yunnan, P.R. China
L.F. Wang
Affiliation:
Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui, P.R.China

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In order to compare X-ray-selected BL Lac objects with radio-selected BL Lac objects, we have carried out optical monitoring of some of these objects for about three years at Yunnan Observatory in China. All observations have been made with a CCD-image system at the f/13.3 Cassegrain focus of the 102-cm RCC telescope. The CCD-image system was developed by Ye et al. in Kitt Peak National Observatory of USA (Ye et al., 1985). The filters used were as follows: B-GG385(2mm)+BG12(1mm)+BG18(1mm), V-GG495(2mm)+BG18(2mm). After observing many times, more complete light curves have obtained for the X-ray-selected BL Lac object IE 0317+186 and the radio-selected BL Lac object ON 231, respectively(Fig 1 and Fig 2). Fig 1 shows that IE 0317+186 has a characteristic timescale of about 4.5hours with an amplitudes of ΔV≃0.65 mag. Fig 2 indicates that a timescale of short-term variability in ON 231 is about 70 min with an amplitudes of ΔB≃0.8 mag.

Type
Part 2: BLR and Variability
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 108 - 109
Copyright
Copyright © Kluwer 1989 

References

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