Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..112m&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Feb. 15, 1980, p. 112-118.
Astronomy and Astrophysics
Astrophysics
29
Astronomical Spectroscopy, Galactic Nuclei, Spiral Galaxies, Star Distribution, Astronomical Catalogs, Galactic Bulge, Galactic Clusters, Line Spectra, Metals, Red Shift
Scientific paper
Spectra of the nuclei of normal spiral galaxies have been classified in terms of the strengths of CN, CH, Ca I, and Ca II features. All of these are found to correlate with the absolute magnitude of the nuclear bulge, as in the case of elliptical galaxies. Thus, the spectroscopic features of spiral nuclei can be used as a velocity-independent method to determine distances to spiral galaxies. The presence of luminosity-sensitive spectral features in spectra of the nuclei of spirals suggests that old horizontal-branch stars rather than young main-sequence stars are the major contributors to the ultraviolet light. Thus, the observed spectral type variations in spiral galaxy nuclei can probably be interpreted predominantly as a metal-abundance rather than an age effect. Evidence is presented indicating that galaxies in the direction of the Virgo cluster which have negative velocities are foreground objects that are not bound to the cluster.
Cowley Anne Pyne
Crampton David
McClure Robert D.
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