Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26as...63...59d&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 63, no. 1, Jan. 1986, p. 59-69.
Astronomy and Astrophysics
Astrophysics
62
Astronomical Photometry, Galactic Nuclei, Seyfert Galaxies, Color, Light Curve
Scientific paper
The authors present the data on VBLUW photometry of 15 Seyfert galaxies obtained between December 1979 and December 1982 and discuss their quality. The variability of Seyfert nuclei on timescales of ≡1 day to ≡1 year is investigated. They find in none of the Seyfert galaxies variations on timescales of ≡1 day. Seyfert nuclei of type 2 do not show significant long term (≡1 year) variability in the period between 1979 and 1982, whereas 10 out of 11 type 1 Seyfert nuclei that were observed during these three years have varied significantly in V, with amplitudes ranging from 0.1 to 0.6 magnitude. The number of objects with variable colour indices decreases monotonically going from (V-B) to the far ultraviolet colour index (U-W); in fact, only one object, Mkn 609, has possibly varied in (U-W). The authors present various two-colour diagrams and show that type 1 Seyfert nuclei have a well-defined locus in these diagrams with a remarkably small scatter (≡0.06 to 0.10 mag).
de Ruiter Hans R.
Lub Jan
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