The Hamburg Quasar Monitoring Program (HQM) at Calar Alto III. Lightcurves of optically violent variable sources

Details The Hamburg Quasar Monitoring Program (HQM) at Calar Alto III. Lightcurves of optically violent variable sources The Hamburg Quasar Monitoring Program (HQM) at Calar Alto III. Lightcurves of optically violent variable sources

1994-03-23

arxiv.org/abs/astro-ph/9403050v1

Astronomy and Astrophysics

Astrophysics

10 pages, Latex laa-Style (A&A 1990), Astron. & Astrophys (Supplements) in press, HH-HQM-JS-94-3

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.

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