The Optical Variability of Two X-Ray Selected and Nine Radio-Selected BL Lac Objects
Abstract
CCD photometry for two x-ray-selected and nine radio-selected BL Lac objects, and one QSO, have been obtained at Yunnan Observatory. The main results show that: (1) IE 0317 + 186 has a short characteristic timescale of about 4.5 hr with amplitudes of {DELTA}V = 0.8 mag and {DELTA}R = 0.52 mag in the visual and red, respectively. (2) ON +231 has shown a variability on a short timescale of about 103 min with an amplitude of {DELTA}B = 0.8 mag. (3) OJ 287 has not shown a previously reported variability on a short timescale of 15.7 min in the B band.
- Publication:
-
The Astronomical Journal
- Pub Date:
- July 1988
- DOI:
- 10.1086/114787
- Bibcode:
- 1988AJ.....96...24X
- Keywords:
-
- Charge Coupled Devices;
- Galactic Nuclei;
- Radio Astronomy;
- Variable Stars;
- X Ray Astronomy;
- Cassegrain Optics;
- Computational Astrophysics;
- Telescopes;
- Astrophysics;
- RADIO SOURCES: GALAXIES;
- GALAXIES: SEYFERT