Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19913821l&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #138.21; Bulletin of the American Astronomical Society, Vol. 33, p.1517
Astronomy and Astrophysics
Astronomy
Scientific paper
Since 1995 the SARA 0.9-m telescope at Kitt Peak has been used to monitor continuum fluxes from a sample of twelve active galaxies. A number of these have been the subject of extensive monitoring campaigns by the International AGN Watch. During the period 2001 May 26-30 a series of CCD images were obtained of the objects NGC 4151, NGC 5548, Mrk 817, Mrk 509, Akn 564, and 3C-390.3 with the SARA telescope. Wide-band V, R, and I magnitudes derived from these images are presented and compared with previous brightness determinations. Of the objects observed the broad-line radio galaxy 3C-390.3 exhibits the greatest change in brightness; it has dimmed by more than one magnitude since 1995. On the final night (May 29-30) of observation 3C-390.3 was observed continuously in the I band to search for evidence of microvariability. The observed brightness fluctuations were less than 0.05 magnitude, with no systematic variation. This work is supported by National Science Foundation grant AST-0097616 and by faculty development and research grants from Valdosta State University.
Levine Robyn D.
Rumstay Kenneth S.
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