Free Access
Astron. Astrophys. Suppl. Ser.
Volume 127, Number 3, February I 1998
Page(s) 445 - 454
Published online 15 February 1998
DOI: 10.1051/aas:1998372

A&A Supplement series, Vol. 127, February I 1998, 445-454

Received February 5; accepted June 5, 1997

Optical photometric monitoring of tex2html_wrap_inline491-ray loud blazarsgif

II. Observations from November 1995 to June 1996

C.M. Raiteritex2html_wrap515, G. Ghisellinitex2html_wrap517, M. Villatatex2html_wrap515, G. De Francescotex2html_wrap515, L. Lanteritex2html_wrap515, M. Chiabergetex2html_wrap525, A. Peilatex2html_wrap525, and G. Anticotex2html_wrap515

Send offprint request: C.M. Raiteri (

tex2html_wrap531  Osservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese (TO), Italy
tex2html_wrap533  Osservatorio Astronomico di Brera, Via Bianchi 46, I-22055 Merate, Italy
tex2html_wrap535  Istituto di Fisica Generale dell'Università, Via Pietro Giuria 1, I-10125 Torino, Italy


New data from the optical monitoring of tex2html_wrap_inline491-ray loud blazars at the Torino Astronomical Observatory are presented. Observations have been taken in the Johnson's B, V, and Cousins' R bands with the tex2html_wrap_inline503 REOSC telescope equipped with a tex2html_wrap_inline505 pixel CCD camera. Many of the 22 monitored sources presented here show noticeable magnitude variations. Periods corresponding to pointings of the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory (CGRO) satellite are indicated on the light curves. The comparison of our data with those taken by CGRO in the tex2html_wrap_inline491-ray band will contribute to better understand the mechanism of the tex2html_wrap_inline491-ray emission. We finally show intranight light curves of 3C 66A and OJ 287, where microvariability was detected.

keywords: galaxies: active -- BL Lacertae objects: general -- quasars: general

SIMBAD Objects
Tables at the CDS

Copyright by the European Southern Observatory (ESO)

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.