Star formation history of early-type galaxies in low density environments. III. The isophote shape parameter and nuclear line-strength indices

Details Star formation history of early-type galaxies in low density environments. III. The isophote shape parameter and nuclear line-strength indices Star formation history of early-type galaxies in low density environments. III. The isophote shape parameter and nuclear line-strength indices

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341..357r&link_type=abstract

Astronomy and Astrophysics, v.341, p.357-360 (1999)

Astronomy and Astrophysics

Astrophysics

4

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Evolution, Galaxies: Formation, Galaxies: Fundamental Parameters, Galaxies: Interactions

Scientific paper

Using two line-strength indices, H+K(CaII) and Delta 4000, sensible to the age of the stellar population, we analyze the correlations between the shape and the `galaxy age' suggested by de Jong & Davies (1997) on the basis that discy galaxies have higher H_beta indices. By enlarging their sample with the present one, we find that the significance of the correlation a_4/a vs. line- strength indices disappears. We conclude that the `age of the stellar population of early-type galaxies' is not correlated to the isophote shape parameter.

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