<i>BVR</i> photometry of comparison stars in selected blazar fields
M. VillataOsservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, ItalyC. M. RaiteriOsservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, ItalyL. LanteriOsservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, ItalyG. SobritoIstituto di Fisica Generale dell'Università di Torino, via P. Giuria 1, I-10125 Torino, ItalyM. CavalloneIstituto di Fisica Generale dell'Università di Torino, via P. Giuria 1, I-10125 Torino, Italy
1998en
ABI
Аннотация
We present photometric sequences in the Johnson's BV and Cousins' R bands in the fields of 10 BL Lacertae objects (BL Lacs) monitored at the Torino Astronomical Observatory. Data were taken during 14 photometric nights from February 1995 to May 1997. The 56 calibrated stars are brighter than and can be used as comparison objects in order to derive the BL Lac magnitudes. Finding charts are included for the stars identification.
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