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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
e-mail: bachevr@astro.bas.bg;
Anton.Strigachev@oma.be
Received May 4; accepted August 17, 2000
Abstract:
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
and
.
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
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