Metallicity Indices for Multi-Population Models.II.Bulges of Galaxies

Details Metallicity Indices for Multi-Population Models.II.Bulges of Galaxies Metallicity Indices for Multi-Population Models.II.Bulges of Galaxies

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.2541i&link_type=abstract

Astronomical Journal v.112, p.2541

Astronomy and Astrophysics

Astronomy

32

Galaxies: Elliptical And Lenticular, Galaxies: Kinematics And Dynamics, Galaxies: Abundances

Scientific paper

We report metallicity indices in the Lick system (Hβ, Fe52, Fe53, NaD, Mg_2_) for a sample of 45 spiral bulges in the southern hemisphere. The velocity dispersion σ was also derived for each object. Spiral bulges and elliptical galaxies show a continuity in diagrams like the plane Mg_2_- or σ-Mg_2_. Using calibrations derived from chemical evolutionary models, we estimated metallicities and abundance ratios for those bulges. The sample mean metallicity is [Fe/H]= -0.19 +/- 0.27(rmsd), and the mean abundance ratios are [Mg/Fe] = 0.46 +/- 0.11 (rmsd) and [Na/Fe] = 0.45 +/- 0.19(rmsd). These abundances suggest that spiral bulges (like E's) were chemically enriched by type II supernovae, and that the main star formation era occurred in a time scale of the order of 1-2 Gyr.

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