Astron. Astrophys. Suppl. Ser.
Volume 147, Number 2, December I 2000
|Page(s)||175 - 180|
|Published online||15 December 2000|
VRI comparison stars for selected active galaxies
Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Chausse Blvd., 1784 Sofia, Bulgaria
2 Royal Observatory of Belgium, Av. Circulaire 3, B-1180 Brussels, Belgium e-mail: email@example.com; Anton.Strigachev@oma.be
Send offprint request to: R. Bachev
Accepted: 17 August 2000
We present V (Johnson) and RI (Cousins) magnitudes of field comparison stars for 12 bright Seyfert galaxies. These stars are closer than 6' (typically 3' - 4') to the galaxy and have V magnitudes between 10m and 6m. The sequences could be used for CCD monitoring and differential photometry of these active galaxies, aimed to better understanding the physics of their variability. Photometric errors of measured stars are in the range . Finding charts () are also included.
Key words: galaxies: Seyfert
© European Southern Observatory (ESO), 2000