SIMBAD references

1994A&AS..106..349S - Astron. Astrophys., Suppl. Ser., 106, 349-359 (1994/August-0)

The Hamburg quasar monitoring program (HQM) at Calar Alto. III. Lightcurves of optically violent variable sources.

SCHRAMM K.-J., BORGEEST U., KUEHL D., VON LINDE J., LINNERT M.D. and SCHRAMM T.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): quasars: general

Simbad objects: 17

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