Abstract
view Abstract Citations (71) References (57) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Metal enrichment in elliptical galaxies and globular clusters through the study of iron and H-beta spectral indices. Buzzoni, A. ; Mantegazza, L. ; Gariboldi, G. Abstract Chemical evolution of elliptical galaxies and globular clusters is addressed through a combined study of the iron indices at 5270 and 5335 A, and of the H-Beta line strength. The observational database of 74 standard stars (both dwarfs and giants) referred to in a previous paper (Buzzoni et al. (1992)) complemented with the data of Faber et al. (1985) and Gorgas et al. (1993) allowed us to explore here Fe and H-Beta index dependence on stellar temperature, gravity, and metallicity. The derived fitting functions were then included into Buzzoni's (1989) code for population synthesis in order to derive expected integrated indices for simple stellar populations and compare with observations. Partition of metals in the current chemical mix of galaxies and globulars has been constrained supporting the claim that light alpha elements might be enhanced in the globular cluster metal-poor population. An alternative conclusion resting on the standard framework with (alpha/Fe) = 0 would require a systematically larger age, about 18-20 Gyr. Iron and magnesium in ellipticals are found in average solar but a systematic trend of (Mg/Fe) vs global metallicity does exist with iron more deficient with respect to magnesium at high Z. We conclude that this effect might indicate that Fe abundance per unit mass in the galaxies is constant (suggesting a constant rate per unit mass of SN I events) while light metals supplied by SNe II should have been more effectively enriched with increasing galactic total mass. Publication: The Astronomical Journal Pub Date: February 1994 DOI: 10.1086/116873 Bibcode: 1994AJ....107..513B Keywords: Chemical Evolution; Dwarf Stars; Elliptical Galaxies; Galactic Evolution; Giant Stars; Globular Clusters; H Beta Line; Iron; Metallicity; Stellar Composition; Stellar Gravitation; Stellar Spectra; Stellar Temperature; Astronomical Spectroscopy; Galactic Mass; Mass Distribution; Stellar Models; Astronomy full text sources ADS | data products SIMBAD (93)
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