Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..106..349s&link_type=abstract
Astronomy and Astrophysics Suppl. 106, 349-359 (1994)
Astronomy and Astrophysics
Astrophysics
28
Quasars: General
Scientific paper
HQM is an optical broad-band photometric monitoring program carried out since September 1988. We use a CCD camera at the MPIA 1.2 m telescope. Fully automatic photometric reduction relative to stars in the frames is done within a few minutes after each exposure, thus interesting brightness changes can be followed in detail. The typical photometric error is 1-2% for a 17.5 mag quasar. We here present lightcurves of 14 known violently variable sources and compare them with literature data. For two BL Lac objects, 1E 1229+645 and 4C 56.27 (1823+568), this paper is the first variability study. We have also carried out POSS photometry to obtain indications for variability on a longer timescale.
Borgeest Ulf
Kuehl D.
Linde von J.
Linnert M. D.
Schramm K.-J.
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