Astron. Astrophys. Suppl. Ser.
Volume 132, Number 1, October I 1998
|Page(s)||83 - 92|
|Published online||15 October 1998|
The intraday variability in the radio-selected and X-ray-selected BL Lacertae objects*
Yunnan Astronomical Observatory, The Chinese Academy of Sciences, Kunming 650011, China
2 United Laboratory of Optical Astronomy, The Chinese Academy of Sciences (ULOAC), China
3 Department of physics of Yunnan Normal University, Kunming, China
Send offprint request to: J.M. Bai
Accepted: 15 April 1998
Seven BL Lac objects have been photometrically observed in an effort to study the difference of optical intraday variability between the radio-selected BL Lac objects (RBLs) and X-ray-selected BL Lac objects (XBLs). The objects we observed are selected arbitrarily. They are four RBLs, PKS 0735+178, PKS 0754+101, OJ 287 and BL Lac, and three XBLs, H 0323+022, H 0548-322 and H 2154-304. During the observation all of them exhibited microvariation, and H 0323+022 and H 0548-322 sometimes showed brightness oscillation. PKS 0735+178 and BL Lac were in their faint states and not very active. It seems that RBLs do not show microvariability more frequently than XBLs.
Key words: BL Lacertae objects: general / galaxies: photometry
Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11)
© European Southern Observatory (ESO), 1998