Optical long-term variability of a sample of quasars in the field around M3

Details Optical long-term variability of a sample of quasars in the field around M3 Optical long-term variability of a sample of quasars in the field around M3

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289...67m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 1, p. 67-75

Statistics

6

Images, Photographic Plates, Quasars, Stellar Magnitude, Variability, Variance (Statistics), Astronomical Photometry, Data Correlation, Image Analysis, Light Curve, Power Spectra, Spectrum Analysis, Statistical Analysis

Scientific paper

The optical long-term variability of a sample of 20 known quasars and 9 quasar candidates in a field around the globular cluster M3 is studied. A large number of Schmidt plates have been measured with a time-baseline of almost three decades. Several methods were applied to estimate the strengths and the timescales of variability. The percentage of quasars with detected variability is between 65% and 85%. There are indications of a significant long-term variability mode in the studied quasar sample.

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