VRI photometry of stars in the fields of 12 BL Lacertae objects.

Details VRI photometry of stars in the fields of 12 BL Lacertae objects. VRI photometry of stars in the fields of 12 BL Lacertae objects.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..116..403f&link_type=abstract

Astronomy and Astrophysics Supplement, v.116, p.403-407

Astronomy and Astrophysics

Astrophysics

81

Bl Lacertae Objects: General

Scientific paper

We present VR_c_I_c_ Johnson-Cousins magnitudes of field comparison stars for twelve BL Lacertae objects belonging to the largest sample of blazars which is monitored at the Perugia University Observatory. The sequences reported here can be used in the long-term CCD photometric monitoring of BL Lac objects aimed to understand the characteristics of their variability. Finding charts for all of these comparison sequences are also included in this paper.

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