Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...70..281b&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 70, no. 2, Aug. 1987, p. 281-301.
Astronomy and Astrophysics
Astrophysics
78
Absorption Spectra, Astronomical Spectroscopy, Galactic Nuclei, Astronomical Catalogs, Data Sampling, Galactic Evolution, Metallicity, Spiral Galaxies, Stellar Spectra, Visible Spectrum
Scientific paper
Spectral observations in the 3700-8000 A range of 154 normal galactic nuclei, two amorphous galaxies, and eight intrinsically faint active nuclei whose visible spectrum is dominated by the stellar component are discussed. A typical red, strong-lined spectrum is found for each group from E to Sb in the -23.2 to -19.0 luminosity range, as well as for the very luminous Sbc and Sc galaxies, although a few atypical nuclei exhibit variable contents of bluer stellar components. No prototype can be assigned to the Sbc and Sc galaxies in the -21.9 to -19.0 luminosity range. Analysis of the equivalent widths shows that the CN 4216-4250 A feature has the largest dynamical range as a function of metallicity. It is suggested that young stars are responsible for the blue colors in NGC2865, 4382, and 5102, and that metal-poor stars do not contribute significantly.
Alloin Danielle
Bica Eduardo
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