BVRI CCD-Photometry of Comparison Stars in the Fields of Galaxies with Active Nuclei. VI
Abstract
Data are presented from observations in the B, V, R, and I bands of 200 comparison stars in the fields of 18 active galactic nuclei (AGN) with right ascensions from 0 to 9 hours over a wide range of stellar magnitudes. Most of the AGN are blazars and quasars. The B, V, R, and I magnitudes of the overwhelming majority of these AGN were not known previously. Finding charts for these stars are provided. These observations can be used for differential photometry of galactic nuclei.
- Publication:
-
Astrophysics
- Pub Date:
- March 2014
- DOI:
- 10.1007/s10511-014-9312-2
- Bibcode:
- 2014Ap.....57...30D
- Keywords:
-
- active galactic nuclei;
- BL Lac objects;
- photometry of comparison stars