A&A Supplement Series, Vol. 125, November I 1997, 525-528
Received June 14, 1996; accepted January 31, 1997
J.H. Fan
, G.Z. Xie
, R.G. Lin
,
Y.P. Qin, K.H. Li, and X. Zhang
Send offprint request: J.H. Fan
CCAST(World Laboratory), P.O. BOX 8730, Beijing, China
Center for Astrophysics, Guangzhou Normal University, Guangzhou 510400, China
Joint Laboratory for Optical Astronomy, Chinese Academy of Sciences, China
Yunnan Observatory, Chinese Academy of Sciences, China
Department of Physics, Yunnan Normal University, Kunming, China
The long-term variability of PKS 0735+178 in B band is shown with some new data presented and discussed by means of Jurkevich's method. The results show with good possibility the presence of a period of 14.2 years. The period of 4.89 years found by Webb et al. (1988) and Smith et al. (1987) might be confirmed with more observations, and their period of 1.2 years can be ruled out.
keywords: BL Lac objects: general -- 0735+178: individual