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Astron. Astrophys. Suppl. Ser. 147, 175-180

VRI comparison stars for selected active galaxies

R. Bachev1 - A. Strigachev1,2 - V. Dimitrov1

Send offprint request: R. Bachev

1 - 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

Received May 4; accepted August 17, 2000


We present V (Johnson) and RI (Cousins) magnitudes of field comparison stars for 12 bright Seyfert galaxies. These stars are closer than 6$^\prime$ (typically 3$^\prime$- 4$^\prime$) to the galaxy and have V magnitudes between $10^{\rm m}$ and $6^{\rm m}$. 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 $0\hbox{$.\!\!^{\rm m}$ }03 - 0\hbox{$.\!\!^{\rm m}$ }06$. Finding charts ( $15\hbox {$^\prime $ }\times 15\hbox {$^\prime $ }$) are also included.

Key words: galaxies: Seyfert

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