| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 130, Number 2, June I 1998
|
|
|---|---|---|
| Page(s) | 305 - 310 | |
| DOI | https://doi.org/10.1051/aas:1998415 | |
| Published online | 15 June 1998 | |
BVR photometry of comparison stars in selected blazar fields
I. Photometric sequences for 10 BL Lacertae objects
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
Send offprint request to: M. Villata, villata@to.astro.it
Received:
19
November
1997
Accepted:
11
December
1997
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.
Key words: galaxies: active / BL Lacertae objects: general
© European Southern Observatory (ESO), 1998