EXPLAINING THE Sr AND Ba SCATTER IN EXTREMELY METAL-POOR STARS

Journal Article · Wed Mar 20 00:00:00 EDT 2013 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/766/1/L13· OSTI ID:22130798

Aoki, W.; Suda, T.; Boyd, R. N.; Kajino, T.

Compilations of abundances of strontium and barium in extremely metal-poor stars show that an apparent cutoff is observed for [Sr/Ba] at [Fe/H] < -3.6 and large fluctuations for [Fe/H] > -3.6 with a clear upper bound depending on metallicity. We study the factors that place upper limits on the logarithmic ratio [Sr/Ba]. A model is developed in which the collapses of type II supernovae are found to reproduce many of the features seen in the data. This model is consistent with galactic chemical evolution constraints of light-element enrichment in metal-poor stars. Effects of turbulence in an explosive site have also been simulated, and are found to be important in explaining the large scatter observed in the [Sr/Ba] data.

• OSTI ID: 22130798
• Journal Information: Astrophysical Journal Letters, Vol. 766, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BARIUM
BLACK HOLES
ENRICHMENT
EQUATIONS OF STATE
EVOLUTION
FLUCTUATIONS
GALAXIES
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
SIMULATION
STARS
STRONTIUM
SUPERNOVAE
TURBULENCE
VISIBLE RADIATION