scholarly journals Self-Enrichment in Globular Clusters: Is There a Role for the Super-Asymptotic Giant Branch Stars?

2007 ◽  
Vol 672 (1) ◽  
pp. L25-L28 ◽  
Author(s):  
M. L. Pumo ◽  
F. D'Antona ◽  
P. Ventura
Keyword(s):  
Globular Clusters ◽  
Asymptotic Giant Branch ◽  
Asymptotic Giant Branch Stars ◽  
Giant Branch Stars

scholarly journals NGC 6388 reloaded: some like it hot, but not too much. New constraints on the first-generation polluters

2019 ◽  
Vol 627 ◽  
pp. L7 ◽  
Author(s):  
Eugenio Carretta ◽  
Angela Bragaglia
Keyword(s):  
High Temperature ◽  
Globular Clusters ◽  
First Generation ◽  
Massive Stars ◽  
Asymptotic Giant Branch ◽  
Asymptotic Giant Branch Stars ◽  
Proton Capture ◽  
Diagnostic Plots ◽  
Giant Branch Stars ◽  
Very High

Multiple stellar populations in globular clusters (GCs) are defined and recognized by their chemical signature. Second-generation stars show the effects of nucleosynthesis in the more massive stars of the earliest component that formed in the first star formation burst. High-temperature H-burning produces the whole pattern of (anti-) correlations in proton-capture elements that are widely found in GCs. However, it is still debated where this burning occurred. Here we introduce new powerful diagnostic plots to detect evidence (if any) of products from proton-capture reactions that occur at very high temperatures. To test these detectors of high-temperature H-burning plots, we show that stringent constraints can be placed on the temperature range of the first-generation polluters that contributed to shaping the chemistry of multiple stellar population in the massive bulge GC NGC 6388. Using the largest sample to date (185 stars) of giants with detailed abundance ratios in a single GC (except ω Cen), we may infer that the central temperature of part of the polluters must have been comprised between ∼100 and ∼150 MK if we consider hydrostatic H-burning in the core of massive stars. A much more narrow range (110−120 MK) is inferred if the polluters can be identified in massive asymptotic giant branch stars.

scholarly journals Modelling self-pollution of globular clusters from asymptotic giant branch stars

2004 ◽  
Vol 353 (3) ◽  
pp. 789-795 ◽  
Author(s):  
Y. Fenner ◽  
S. Campbell ◽  
A. I. Karakas ◽  
J. C. Lattanzio ◽  
B. K. Gibson
Keyword(s):  
Globular Clusters ◽  
Asymptotic Giant Branch ◽  
Asymptotic Giant Branch Stars ◽  
Giant Branch Stars

scholarly journals Globular cluster abundances: the role of asymptotic giant branch stars

2009 ◽  
Vol 5 (S266) ◽  
pp. 161-168
Author(s):  
Amanda I. Karakas
Keyword(s):  
Globular Cluster ◽  
Globular Clusters ◽  
Asymptotic Giant Branch ◽  
Asymptotic Giant Branch Stars ◽  
Agb Stars ◽  
Modelling Uncertainties ◽  
Low Metallicity ◽  
Abundance Anomalies ◽  
Giant Branch Stars

AbstractOne of the more popular theories to account for the abundance anomalies in globular cluster stars is the ‘self-pollution scenario,’ where the polluters were a previous generation of intermediate-mass asymptotic giant branch (AGB) stars. This idea has proved attractive because: (i) the hot-bottom burning experienced by these objects qualitatively provides an ideal proton-capture environment to produce helium and convert C and O to N, Ne to Na and Mg to Al, and (ii) the slow winds from these stars allow their retention by the cluster's gravitational potential. New stellar yields from low-metallicity AGB models are presented and compared to abundances derived in globular clusters. We also discuss external pollution and inhomogeneous-pollution models that use AGB stars as polluters. Current models of AGB stars cannot match all observational features of globular cluster stars. However, stellar modelling uncertainties are considerable and suggest AGB stars should not be ruled out just yet.

scholarly journals Multiple Stellar Populations in Asymptotic Giant Branch Stars of Galactic Globular Clusters

2021 ◽  
Vol 910 (1) ◽  
pp. 6
Author(s):  
E. P. Lagioia ◽  
A. P. Milone ◽  
A. F. Marino ◽  
M. Tailo ◽  
A. Renzini ◽  
...  
Keyword(s):  
Globular Clusters ◽  
Stellar Populations ◽  
Asymptotic Giant Branch ◽  
Asymptotic Giant Branch Stars ◽  
Galactic Globular Clusters ◽  
Giant Branch Stars

scholarly journals The pollution of the interstellar medium from AGB stars in Globular Clusters

2012 ◽  
Vol 10 (H16) ◽  
pp. 249-250
Author(s):  
Paolo Ventura ◽  
Roberta Carini
Keyword(s):  
Globular Cluster ◽  
Globular Clusters ◽  
The Self ◽  
Asymptotic Giant Branch ◽  
Asymptotic Giant Branch Stars ◽  
Agb Stars ◽  
Initial Value ◽  
Low Metallicity ◽  
Giant Branch Stars ◽  
High Metallicity

AbstractWe discuss the yields from Asymptotic Giant Branch stars, depending on their mass and metallicity. In agreement with previous investigations, we find that the extent of Hot Bottom Burning increases with mass. The yields of models with chemistry typical of high–metallicity Globular Clusters, i.e. Z = 0.008, show only a modest depletion of magnesium, and an oxgen depletion of ~ 0.4 dex. Low–metallicity yields show a much stronger magnesium depletion, and a dramatic drop in the oxygen content, ~ 1.2dex smaller than the initial value. We suggest that the Globular Cluster NGC 2419 is a possible target to the hypothesis of the self–enrichment scenario of Globular Clusters by the winds of Asymptotic Giant Branch stars.

Observations of High Rotational CO Lines in Post–Asymptotic Giant Branch Stars and Planetary Nebulae

1997 ◽  
Vol 476 (1) ◽  
pp. 319-326 ◽  
Author(s):  
K. Justtanont ◽  
A. G. G. M. Tielens ◽  
C. J. Skinner ◽  
Michael R. Haas
Keyword(s):  
Planetary Nebulae ◽  
Asymptotic Giant Branch ◽  
Asymptotic Giant Branch Stars ◽  
Giant Branch Stars
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