Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..513b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 107, no. 2, p. 513-529
Astronomy and Astrophysics
Astronomy
63
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
Scientific paper
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.
Buzzoni Alberto
Gariboldi Giorgio
Mantegazza Luciano
No associations
LandOfFree
Metal enrichment in elliptical galaxies and globular clusters through the study of iron and H-Beta spectral indices does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Metal enrichment in elliptical galaxies and globular clusters through the study of iron and H-Beta spectral indices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metal enrichment in elliptical galaxies and globular clusters through the study of iron and H-Beta spectral indices will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1013556