The Chemical Evolution of Globular Clusters - II. Metals and Fluorine

Abstract

In the first paper in this series, we proposed a new framework in which to model the chemical evolution of globular clusters. This model, is predicated upon the assumption that clusters form within an interstellar medium enriched locally by the ejecta of a single Type Ia supernova and varying numbers of asymptotic giant branch stars, superimposed on an ambient medium pre-enriched by low-metallicity Type II supernovae. Paper I was concerned with the application of this model to the observed abundances of several reactive elements and so-called non-metals for three classical intermediate-metallicity clusters, with the hallmark of the work being the successful recovery of many of their well-known elemental and isotopic abundance anomalies. Here, we expand upon our initial analysis by (a) applying the model to a much broader range of metallicities (from the factor of three explored in Paper I, to now, a factor of ~50; i.e., essentially, the full range of Galactic globular cluster abundances, and (b) incorporating a broader suite of chemical species, including a number of iron-peak isotopes, heavier alpha-elements, and fluorine. While most empirical globular cluster abundance trends are reproduced, our model would suggest the need for a higher production of Ca, Si, and Cu in low-metallicity (or so-called "prompt") Type Ia supernovae than predicted in current stellar models in order to reproduce the observed trends in NGC 6752, and a factor of two reduction in carbon production from asymptotic giant branch stars to explain the observed trends between carbon and nitrogen. Observations of heavy-element isotopes produced primarily by Type Ia supernovae, including those of titanium, iron, and nickel, could support/refute unequivocally our proposed framework. Hydrodynamical simulations would be necessary to study its viability from a dynamical point of view.

Accepted for publication in MNRAS, 15 pages, 10 figures

References in corpus (20)

• Galactic chemical evolution: Carbon through Zinc
• Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
• Formation and Dynamical Evolution of Multiple Stellar Generations in Globular Clusters
• Spectroscopic and Photometric evidence of two stellar populations in the Galactic Globular Cluster NGC6121 (M4)
• Stellar Models and Yields of Asymptotic Giant Branch Stars
• On the self-enrichment scenario of galactic globular clusters: Constraints on the IMF
• Origin of the abundance patterns in Galactic globular clusters: constraints on dynamical and chemical properties of globular clusters
• Nitrogen abundances in giant stars of the globular cluster NGC 6752
• A model for the Globular Cluster extreme anomalies
• A new abundance scale for the globular cluster 47 Tuc
• Origin of Abundance Inhomogeneity in Globular Clusters
• Chemical Abundance Analysis of the Extremely Metal-Poor Star HE 1300+0157
• The Chemical Evolution of Dwarf Spheroidal Galaxies: Dissecting the Inner Regions and their Stellar Populations
• Contrasting copper evolution in Omega Centauri and the Milky Way
• The Chemical Evolution of Globular Clusters I. Reactive Elements and Non-Metals
• O and Na abundance patterns in open clusters of the Galactic disk
• Variations in the lithium abundances of turn off stars in the globular cluster 47 Tuc
• The impact of the 18F(a,p)21Ne reaction on asymptotic giant branch nucleosynthesis
• Isotopic Titanium Abundances in Local M Dwarfs
• Surface pollution of main-sequence stars through encounters with AGB ejecta in omega Centauri

Cited by in corpus (7)

• Multiple Stellar Populations in Globular Clusters
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• Abundances of lithium, oxygen, and sodium in the turn-off stars of Galactic globular cluster 47 Tuc
• Integral Field Spectroscopy and multi-wavelength imaging of the nearby spiral galaxy NGC5668: an unusual flattening in metallicity gradient
• On the role of Type Ia supernovae in the second generation star formation in globular clusters
• Pre-main sequence accretion and the formation of multiple populations in Globular Clusters
• First Evidence of Globular Cluster Formation from the Ejecta of Prompt Type Ia Supernovae