<i>BVR</i> photometry of comparison stars in selected blazar fields
C. M. RaiteriOsservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, ItalyM. VillataOsservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, ItalyL. LanteriOsservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, ItalyM. CavalloneIstituto di Fisica Generale dell'Università di Torino, Via P. Giuria 1, I-10125 Torino, ItalyG. SobritoIstituto di Fisica Generale dell'Università di Torino, Via P. Giuria 1, I-10125 Torino, Italy
1998en
ABI
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 Cassegrain REOSC telescope equipped with a pixel CCD camera. All stars are brighter than and are useful comparison objects for the evaluation of the quasar magnitudes.
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