Issue |
Astron. Astrophys. Suppl. Ser.
Volume 132, Number 1, October I 1998
|
|
---|---|---|
Page(s) | 83 - 92 | |
DOI | https://doi.org/10.1051/aas:1998360 | |
Published online | 15 October 1998 |
The intraday variability in the radio-selected and X-ray-selected BL Lacertae objects*
1
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
Received:
27
September
1997
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
© European Southern Observatory (ESO), 1998