Astron. Astrophys. Suppl. Ser. 130, 495-500

BVR photometry of comparison stars in selected blazar fields

II. Photometric sequences for 9 quasars

C.M. Raiteri¹ - M. Villata¹ - L. Lanteri¹ - M. Cavallone² - G. Sobrito²

Send offprint request: C.M. Raiteri,
e-mail: raiteri@to.astro.it

1 - Osservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, Italy
2 - Istituto di Fisica Generale dell'Università di Torino, Via P. Giuria 1, I-10125 Torino, Italy

Received December 22, 1997; accepted January 28, 1998

Abstract:

In the course of the blazar monitoring activity at the Torino Astronomical Observatory, we obtained standard BVR magnitudes for 36 stars and standard VR magnitudes for 10 stars in the fields of 9 quasars. Observations were done during 14 photometric nights with the $1.05 \, \rm m$ Cassegrain REOSC telescope equipped with a $1242 \times 1152$ pixel CCD camera. All stars are brighter than V=16.6 and are useful comparison objects for the evaluation of the quasar magnitudes.

Key words: galaxies: active -- quasars: general