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Barium Abundances in Extremely Metal-poor Stars
Open accessAbstract
New, improved, barium abundances for 33 extremely metal-poor halo stars from the 1995 sample of McWilliam et al. have been computed. The mean [Ba/Eu] ratio for stars with [Fe/H] ≤ -2.4 is -0.69 ± 0.06 dex, consistent with pure r -process nucleosynthesis within the measurement uncertainties. Although the [Sr/Fe] and [Ba/Fe] abundance ratios span a range of 2.6 dex, the mean values are approximately constant with [Fe/H]. This is consistent with a model of chemical evolution in which the parent clouds were enriched by small numbers of supernova events. In this model, the decreasing heavy-element dispersion with increasing [Fe/H] is simply due to the averaging of element yields from many supernovae at higher [Fe/H]; however, it is necessary to increase the number of extremely metal-poor stars known in order to confirm this picture. In addition to the random Sr component from the r -process, the [Sr/Ba] ratios indicate that there is a second, also random, source of Sr from an as yet unidentified nucleosynthesis site.
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Cited by
Galactic Evolution of Sr, Y, and Zr: A Multiplicity of Nucleosynthetic Processes
Travaglio, C., Gallino, R., Arnone, E., Cowan, J., Jordan, F., & Sneden, C. (2004) · The Astrophysical Journal · doi:10.1086/380507 · Cited by 635
Carbon‐enhanced Metal‐poor Stars. I. Chemical Compositions of 26 Stars
Aoki, W., Beers, T. C., Christlieb, N., Norris, J. E., Ryan, S. G., & Tsangarides, S. (2007) · The Astrophysical Journal · doi:10.1086/509817 · Cited by 496
Busso, M., Gallino, R., Lambert, D. L., Travaglio, C., & Smith, V. V. (2001) · The Astrophysical Journal · doi:10.1086/322258 · Cited by 437
The Rise of the s ‐Process in the Galaxy
Simmerer, J., Sneden, C., Cowan, J. J., Collier, J., Woolf, V. M., & Lawler, J. E. (2004) · The Astrophysical Journal · doi:10.1086/424504 · Cited by 380
Galactic Chemical Evolution of Heavy Elements: From Barium to Europium
Travaglio, C., Galli, D., Gallino, R., Busso, M., Ferrini, F., & Straniero, O. (1999) · The Astrophysical Journal · doi:10.1086/307571 · Cited by 278
Metadata
- Authors
- McWilliam, A.
- Venue
- The Astronomical Journal
- Publisher
- American Astronomical Society
- Published
- 1998-04
- Volume
- 115
- Issue
- 4
- Pages
- 1640-1647
- ISSN
- 0004-6256 (ISSN-L)
- OpenAlex
- W2039278128
- Cited by
- 464
- References
- 0
- FWCI
- 12.36
- Type
- journal article
- Language
- en
- Open access
- bronze
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