On Potassium and Other Abundance Anomalies of Red Giants In NGC 2419
Abstract
Globular clusters are of paramount importance for testing theories of stellar evolution and early galaxy formation. Strong evidence for multiple populations of stars in globular clusters derives from observed abundance anomalies. A puzzling example is the recently detected Mg–K anticorrelation in NGC 2419. We perform Monte Carlo nuclear reaction network calculations to constrain the temperature–density conditions that gave rise to the elemental abundances observed in this elusive cluster. We find a correlation between stellar temperature and density values that provide a satisfactory match between simulated and observed abundances in NGC 2419 for all relevant elements (Mg, Si, K, Ca, Sc, Ti, and V). Except at the highest densities (ρ≳108 g cm-3), the acceptable conditions range from ≈100 MK at ≈108 g cm-3 to ≈200 MK at ≈10-4 g cm-3. This result accounts for uncertainties in nuclear reaction rates and variations in the assumed initial composition. We review hydrogen- burning sites and find that low-mass stars, asymptotic giant branch (AGB) stars, massive stars, or supermassive stars cannot account for the observed abundance anomalies in NGC 2419. Super-AGB stars could be viable candidates for the polluter stars if stellar model parameters can be fine-tuned to produce higher temperatures. Novae, involving either COmore »
- Authors:
-
[2];
[3];
[4];
- Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
- Australian National Univ., Canberra, ACT (Australia)
- Université P. & M. Curie, Paris (France). Inst. d'Astrophysique de Paris
- Monash Univ., Melbourne, VIC (Australia). Monash Centre for Astrophysics
- Publication Date:
- Research Org.:
- University of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); Australian Research Council (ARC)
- OSTI Identifier:
- 1660982
- Alternate Identifier(s):
- OSTI ID: 1660983
- Grant/Contract Number:
- FG02-97ER41041; FG02-97ER41033
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 818; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Iliadis, C., Karakas, A. I., Prantzos, N., Lattanzio, J. C., and Doherty, C. L. On Potassium and Other Abundance Anomalies of Red Giants In NGC 2419. United States: N. p., 2016.
Web. doi:10.3847/0004-637x/818/1/98.
Iliadis, C., Karakas, A. I., Prantzos, N., Lattanzio, J. C., & Doherty, C. L. On Potassium and Other Abundance Anomalies of Red Giants In NGC 2419. United States. https://doi.org/10.3847/0004-637x/818/1/98
Iliadis, C., Karakas, A. I., Prantzos, N., Lattanzio, J. C., and Doherty, C. L. Wed .
"On Potassium and Other Abundance Anomalies of Red Giants In NGC 2419". United States. https://doi.org/10.3847/0004-637x/818/1/98. https://www.osti.gov/servlets/purl/1660982.
@article{osti_1660982,
title = {On Potassium and Other Abundance Anomalies of Red Giants In NGC 2419},
author = {Iliadis, C. and Karakas, A. I. and Prantzos, N. and Lattanzio, J. C. and Doherty, C. L.},
abstractNote = {Globular clusters are of paramount importance for testing theories of stellar evolution and early galaxy formation. Strong evidence for multiple populations of stars in globular clusters derives from observed abundance anomalies. A puzzling example is the recently detected Mg–K anticorrelation in NGC 2419. We perform Monte Carlo nuclear reaction network calculations to constrain the temperature–density conditions that gave rise to the elemental abundances observed in this elusive cluster. We find a correlation between stellar temperature and density values that provide a satisfactory match between simulated and observed abundances in NGC 2419 for all relevant elements (Mg, Si, K, Ca, Sc, Ti, and V). Except at the highest densities (ρ≳108 g cm-3), the acceptable conditions range from ≈100 MK at ≈108 g cm-3 to ≈200 MK at ≈10-4 g cm-3. This result accounts for uncertainties in nuclear reaction rates and variations in the assumed initial composition. We review hydrogen- burning sites and find that low-mass stars, asymptotic giant branch (AGB) stars, massive stars, or supermassive stars cannot account for the observed abundance anomalies in NGC 2419. Super-AGB stars could be viable candidates for the polluter stars if stellar model parameters can be fine-tuned to produce higher temperatures. Novae, involving either CO or ONe white dwarfs, could be interesting polluter candidates, but a current lack of low-metallicity nova models precludes firmer conclusions. We also discuss whether additional constraints for the first-generation polluters can be obtained by future measurements of oxygen, or by evolving models of second- generation low-mass stars with a non-canonical initial composition.},
doi = {10.3847/0004-637x/818/1/98},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 818,
place = {United States},
year = {Wed Feb 10 00:00:00 EST 2016},
month = {Wed Feb 10 00:00:00 EST 2016}
}
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