Other
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..457s&link_type=abstract
Astronomy and Astrophysics, v.325, p.457-472
Other
14
Quasars: General, Galaxies: Photometry, Stars: Variables: Other, Astrometry, Methods: Statistical, Surveys
Scientific paper
We describe the first combined variability-proper motion survey for QSOs on Schmidt plates. 85 Tautenburg Schmidt plates covering about 9 square degrees near the north Galactic pole were digitised by means of the APM facility in Cambridge. Variability indices have been derived from U and B data, both with a time-baseline of three decades. Structure function analysis has been applied to search for long-term variability. An almost complete set of proper motions were obtained to a mean B=~20 with a mean error of about 2.0mas/yr for B<19.5. Adopting a limiting (completeness) magnitude of B_lim_=19.7 the success rate of the survey is estimated to >40 per cent. The completeness of the QSO sample detected by this survey is expected to about 90 per cent. The final sample contains 168 QSO candidates; only one has a radio counterpart. The variability-proper motion survey is compared with the selection based on the two-colour index diagram.
Irwin Mike
Meusinger Helmut
Scholz Ralf-Dieter
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