%0 Journal Article
%A Goudfrooij, Paul
%A Gorgas García, Francisco Javier
%A Jablonka, Pascale
%T Line strengths and line strength gradients in bulges along the Hubble sequence
%D 1999
%@ 0004-640X
%U https://hdl.handle.net/20.500.14352/59929
%X We present first results of a comprehensive survey of deep long-slit spectra along the minor axis of bulges of edge-on spiral galaxies. Our results indicate that stellar populations in bulges are fairly old and encompass a range of metallicities. The luminosity-weighted ages of bulges range from those found for cluster ellipticals to slightly 'younger' (by up to only a few Gyr, however). Their alpha/Fe element ratio is typically supersolar, consistent with those found in giant ellipticals. The radial line-strength gradients in bulges correlate with bulge luminosity. Generally, these findings are more compatible with predictions of the 'dissipative collapse' model than with those of the 'secular evolution' model.
%~