Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.0308s&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #03.08; Bulletin of the American Astronomical Society, Vol. 24, p.731
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary results from a brightness monitoring program of > 150 QSOs. Short exposures were obtained using a TI CCD on the Las Campanas 40-inch Swope telescope. Observations of the QSOs have been taken several times per year over the course of the last few years. Brightness variations have been determined relative to stars contained in the ~ 5 arcmin square CCD field. One purpose of the program is to investigate the characteristics of the brightness variations among various types of QSOs: (1) radio-quiet QSOs with broad absorption lines (BALs), (2) radio-quiet QSOs without BALs and (3) radio-loud QSOs. We find no large differences in the variability properties between these three QSO types over a time scale of a few years. The investigation is continuing in order to determine if more subtle differences between the types exist or if differences are apparent on longer time scales.
Duhalde Oscar
Krzeminski Wojciech
Kunkel William
Monier Eric
Morris Simon
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