Rapid optical variability of NGC 7469: UBV photometry

Details Rapid optical variability of NGC 7469: UBV photometry Rapid optical variability of NGC 7469: UBV photometry

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995astl...21..581l&link_type=abstract

Astronomy Letters, Volume 21, Issue 5, September 1995, pp.581-597; Pis'ma v Astronomicheskii Zhurnal, Vol. 21, p. 652

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Results of three-color (UBV) observations of rapid variations in the nucleus of the Seyfert galaxy NGC 7469 carried out between 1990 and 1994 are reported. The observations were conducted on 15 nights with the 60- and 125-cm telescopes with a time resolution of 6 - 8 min (50 h of monitoring). The observing run on a single night lasted from 2 to 5 h. The variations differed in amplitude on different nights: from small variations, with a nightly standard deviation exceeding the error of a single measurement by only 10 - 20%, to large variations, with a standard deviation twice the measurement error. The rapid variability occurs on different time scales, ranging from the duration of an observing run to the time resolution ({DELTA}t~7 min), or possibly even shorter. The maximum amplitude was observed in the V band, in contrast to the slow variability when the amplitude is maximal in the U band. On average, the variations in different bands are uncorrelated, although a correlation is occasionally observed on shorter time scales. In some cases, there is a noticeable delay in the variations in the U band relative to those in the V band and vice versa. This delay amounts to about 7 min. The color indices of the variable source in the nucleus of NGC 7469 decrease with decreasing brightness. It is concluded that the nucleus harbors more than one variable source.

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