Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pazh....6..323c&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 6, June 1980, p. 323-328.) Soviet Astronomy Letters, vol. 6, May-June 1980, p. 178-181.
Astronomy and Astrophysics
Astronomy
3
Astronomical Photometry, Astronomical Spectroscopy, Galactic Radiation, H Lines, Light Curve, Spectral Line Width, Spectrum Analysis, Cosmic Dust, H Beta Line, Oxygen Spectra
Scientific paper
From spectrograms of 3C 120 obtained with an image-tube spectrograph on the 102-inch Crimean reflector on 21 nights during 1972-1979, equivalent widths are determined for the H alpha, H beta, and lambda 4959 (O III) emission lines. Comparison with Lytyi's photoelectric photometry (1977) shows that the light variations in the nucleus of the galaxy were accompanied by variations of the H beta lines, whereas the lambda 4959 (O III) flux remained essentially stable. Neither the equivalent-width ratio of H alpha and H beta nor the form of their profiles experienced appreciable change. The variability phenomena observed may possibly be attributable to the presence of dust.
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