VBLUW photometry of the Seyfert galaxy NGC 1566

Details VBLUW photometry of the Seyfert galaxy NGC 1566 VBLUW photometry of the Seyfert galaxy NGC 1566

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....96...78v&link_type=abstract

Astronomy and Astrophysics, vol. 96, no. 1-2, Mar. 1981, p. 78-81.

Astronomy and Astrophysics

Astrophysics

4

Astronomical Photometry, Electrophotometers, Galactic Nuclei, Seyfert Galaxies, Visual Photometry, Brightness, H Ii Regions, Interstellar Extinction, Light Curve, Ubv Spectra

Scientific paper

A discussion is presented of VBLUW photometry (Walraven system) of the central area and the area along the N/S axis of the Seyfert galaxy NGC 1566, made in 1977 and 1978. The light curve does not show much variation of the nucleus within the six months of observation. All available UBV photometry from literature has been used to discuss the magnitude- and color-aperture diagrams. No convincing evidence is found for any strong variation of the nucleus from 1963 up to 1978. The uncertainties involved in the UBV photometries and in the precise setting of the diaphragms are serious difficulties, which can wipe out possible small amplitude variations. The colors of the spiral arms point to a large contribution of H II regions. The interstellar extinction is estimated to amount to less than or equal to 0.75 mag.

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