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A&A Supplement Series, Vol. 125, November I 1997, 525-528

Received June 14, 1996; accepted January 31, 1997

The long-term variability of BL Lac object PKS 0735+178

J.H. Fantex2html_wrap1041, G.Z. Xietex2html_wrap1043, R.G. Lintex2html_wrap1045, Y.P. Qintex2html_wrap1043, K.H. Litex2html_wrap1043, and X. Zhangtex2html_wrap1051

Send offprint request: J.H. Fan
tex2html_wrap532  CCAST(World Laboratory), P.O. BOX 8730, Beijing, China
tex2html_wrap532  Center for Astrophysics, Guangzhou Normal University, Guangzhou 510400, China
tex2html_wrap534  Joint Laboratory for Optical Astronomy, Chinese Academy of Sciences, China
tex2html_wrap536  Yunnan Observatory, Chinese Academy of Sciences, China
tex2html_wrap538  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

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