Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apjs...35..397p&link_type=abstract
Astrophysical Journal Supplement Series, vol. 35, Dec. 1977, p. 397-418. Research supported by the National Research Council of
Astronomy and Astrophysics
Astrophysics
71
Galactic Nuclei, Galactic Structure, Spectrophotometry, Star Distribution, Andromeda Galaxy, Stellar Spectra, Stellar Spectrophotometry, Tables (Data)
Scientific paper
A Fourier spectrometer has been used to obtain continuous spectrophotometric data for the nuclear bulges of M31, M32, M51, M81, M86, M87, M94, NGC 3115, and NGC 5195. The data provide spectral coverage from 4200 to 6800 A with a resolution ranging from 15 to 50 A; the observations have been supplemented by stellar spectrophotometry obtained with the same instrumentation. These data have been used to construct stellar population models of galactic nuclei with potentially higher accuracy than has been attained previously. The models suggest that the nuclear bulges of intrinsically luminous galaxies possess quite similar late-type stellar populations. The giant-branch luminosity function in these galaxies is indistinguishable from that observed for old disk giants in the Galaxy. The giant branch contributes approximately 50% of the integrated visual light of galaxies such as M31. There appears to be strong evidence that stars in the nuclei of intrinsically luminous galaxies are not spectroscopically similar to stars in the solar neighborhood.
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