Evolution of long-lived globular cluster stars. II. Sodium abundance variations on the asymptotic giant branch as a function of globular cluster age and metallicity

Abstract

Long-lived stars in GCs exhibit chemical peculiarities with respect to their halo counterparts. In particular, Na-enriched stars are identified as belonging to a 2d stellar population born from cluster material contaminated by the H-burning ashes of a 1st stellar population. Their presence and numbers in different locations of the CMDs provide important constraints on the self-enrichment scenarios. In particular, the ratio of Na-poor to Na-rich stars on the AGB has recently been found to vary strongly from cluster to cluster, while it is relatively constant on the RGB. We investigate the impact of both age and metallicity on the theoretical Na spread along the AGB within the framework of the fast rotating massive stars scenario for GC self-enrichment. (tb continued)

10 pages, 7 figures, accepted for publication in A&A

References in corpus (13)

• Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
• 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
• Light nuclei in galactic globular clusters : constraints on the self-enrichment scenario from nucleosynthesis
• Looking outside the Galaxy: the discovery of chemical anomalies in 3 old Large Magellanic Cloud clusters
• Studying the YMC population of M83: how long clusters remain embedded, their interaction with the ISM and implications for GC formation theories
• Mass loss on the red giant branch: the value and metallicity dependence of Reimers' η in globular clusters
• Chemical composition and constraints on mass loss for globular clusters in dwarf galaxies: WLM and IKN
• Constraining Globular Cluster Formation Through Studies of Young Massive Clusters - IV. Testing the Fast Rotating Massive Star Scenario
• AGB Sodium Abundances in the Globular Cluster 47 Tucanae (NGC 104)
• On the missing second generation AGB stars in NGC6752
• Evolution of long-lived globular cluster stars I. Grid of stellar models with helium enhancement at [Fe/H] = -1.75
• Are there any first-generation stars in globular clusters today?

Cited by in corpus (13)

• The Gaia-ESO survey: impact of extra-mixing on C- and N-abundances of giant stars
• Revisiting nucleosynthesis in globular clusters: the case of NGC 2808 and the role of He and K
• Photometry and spectroscopy of multiple populations along the AGB of NGC2808 and NGC6121 (M4)
• Evolution of long-lived globular cluster stars III. Effect of the initial helium spread on the position of stars in a synthetic Hertzsprung-Russell diagram
• Multiple stellar populations and their evolution in globular clusters: A nucleosynthesis perspective
• Sodium abundances of AGB and RGB stars in Galactic globular clusters II. Analysis and results of NGC 104, NGC 6121 and NGC 6809
• An extreme paucity of second population AGB stars in the normal globular cluster M4
• Sodium abundances of AGB and RGB stars in galactic globular clusters I. Analysis and results of NGC 2808
• AGB subpopulations in the nearby globular cluster NGC 6397
• Evolution of long-lived globular cluster stars IV. Initial helium content and white-dwarf properties
• Multiple populations within globular clusters in Early-type galaxies Exploring their effect on stellar initial mass function estimates
• Globular Cluster formation in a collapsing supershell
• He-enriched STAREVOL models for globular cluster multiple populations. Self-consistent isochrones from ZAMS to the TP-AGB phase