Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.121..147d&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 121, no. 1, April 1986, p. 147-160. CNPq-FINEP-supported research.
Astronomy and Astrophysics
Astrophysics
6
Galactic Nuclei, Spectrophotometry, Spiral Galaxies, Absorption Spectra, Interstellar Extinction, Nonthermal Radiation, Seyfert Galaxies, Spectral Line Width, Stellar Evolution, Ubv Spectra
Scientific paper
Spectrophotometry and UBV photometry of the central region of spiral galaxies are presented. The sample consists of the Seyfert galaxies NGC 1566, 3783 and IC 4329A, as well as NGC 1097, 2997, and 5236 containing peculiar nuclei, and NGC 5530, 5643, and 6699 with normal nuclei. The stellar composition of the nuclei was derived by treating the equivalent widths of a sample of absorption lines with the method of constrained nonlinear optimization. The observed continua and the UBV colors were compared with the theoretical results in order to obtain the internal reddening and determine the contribution of the hot gas or nonthermal radiation. The age of the last cycle of star formation, the internal absorption, and the theoretical relations M/L and H/K Ca II, present differences among the three types of nuclei.
Dottori Horácio Alberto
Pastoriza Miriani Griselda
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