Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes

Abstract

We follow the Galactic enrichment of three easily observed light n-capture elements Sr,Y,and Zr.Input stellar yields have been first separated into their respective main and weak s-process,and r-process components.The s-process yields from AGB stars are computed,exploring a wide range of efficiencies of the major neutron source,13C,and covering both disk and halo metallicities.AGBs have been shown to reproduce the main s-component in the solar system.The concurrent weak s-process,which accounts for the major fraction of the light s-process isotopes in the solar system and occurs in massive stars by the operation of the 22Ne n-source,is discussed in detail.Neither the main s-,nor the weak s-components are shown to contribute significantly to the n-capture element abundances observed in unevolved halo stars.We present a detailed analysis of a large database of spectroscopic observations of Sr,Y,Zr, Ba,and Eu for Galactic stars at various metallicities.Spectroscopic observations of Sr,Y,and Zr to Ba and Eu abundance ratios versus metallicity provide useful diagnostics of the types of n-capture processes forming Sr,Y and Zr.The observed [Sr,Y,Zr/Ba,Eu] ratio is clearly not flat at low metallicities,as we would expect if Ba,Eu and Sr,Y,Zr all had the same r-process origin.We discuss our chemical evolution predictions, taking into account the interplay between different processes to produce Sr-Y-Zr.We find hints for a primary process in low-metallicity massive stars, different from the 'classical s-process' and from the 'classical r-process',that we tentatively define LEPP (Lighter Element Primary Process).This allows us to revise the estimates of the r-process contributions to the solar Sr,Y and Zr abundances,as well as of the contribution to the s-only isotopes 86Sr,87Sr,96Mo.

Accepted for ApJ, 52 pages, 12 figures

References in corpus (3)

• The Extremely Metal-Poor, Neutron-Capture-Rich Star CS 22892-052: A Comprehensive Abundance Analysis
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• The 95zr(n, gamma)96zr cross section from the surrogate ratio method and its effect on the s-process nucleosynthesis
• Measurement of the stellar ${}^{58}$Ni$(n,\gamma {)}^{59}$Ni cross section with AMS
• Heavy elements in old very metal-rich stars
• Possible discovery of the r-process characteristics in the abundances of metal-rich barium stars
• The Aquarius Co-Moving Group is Not a Disrupted Classical Globular Cluster
• Origin of the Chemical Elements
• On the validity of the spectroscopic age indicators [Y/Mg], [Y/Al], [Y/Si], [Y/Ca], and [Y/Ti] for giant stars
• Enrichment of the Galactic disc with neutron-capture elements: Gd, Dy, and Th
• Abundance Analysis of New $r$-Process-Enhanced Stars from the HESP-GOMPA Survey
• The study of s-process nucleosynthesis based on barium stars, CEMP-s and CEMP-r/s stars
• Exploring the dependence of chemical traits on metallicity: chemical trends for red giant stars with asteroseismic ages
• The s process in massive stars, a benchmark for neutron capture reaction rates
• The NuGrid AGB Evolution and Nucleosynthesis Data Set
• Unlocking the mystery of Sr synthesis in the early Galaxy through analysis of barium isotopes in very metal-poor stars
• Chemical abundances of the metal-poor horizontal-branch stars CS 22186-005 and CS 30344-033
• Investigation of the single neutron exposure model for the s-process: the primary nature of the neutron source
• A chemodynamical analysis of bright metal-poor stars from the HESP-GOMPA survey -- Indications of a non-prevailing site for light r-process elements
• The Abundance of Lead in Four Metal-Poor Stars
• Estimating R-Process Yields from Abundances of the Metal-Poor Stars
• An Actinide-boost Star Discovered in the Gaia-Sausage-Enceladus
• Abundances of disk and bulge giants from high-resolution optical spectra V. Molybdenum -- the p-process element
• Study of the abundance features of the metal-poor star HD 94028
• The evolutionary status of the bright high-latitude supergiant HD190390
• The Origin of the Metal-Poor Common Proper Motion Pair HD 134439/134440: Insights from New Elemental Abundances
• Chemical Evolution of the Juvenile Universe
• The neutron-capture and alpha-elements abundance ratios scatter in old stellar populations. Cosmological simulations of the stellar halo
• A New Contributor to Chemical Evolution in High-Redshift Galaxies
• Dependence of the Sr-to-Ba and Sr-to-Eu Ratio on the Nuclear Equation of State in Metal Poor Halo Stars
• Peculiarities of Abundances of Selected Elements in Metal-Rich Field RR Lyrae Stars
• The R-Process Alliance: Exploring the cosmic scatter among ten r-process sites with stellar abundances
• Impact of $\text{T}$- and $\rho$-dependent decay rates and new (n,$\gamma$) cross sections on the $\text{s}$ process in low-mass AGB stars
• The impact of rare events on the chemical enrichment in dwarf galaxies
• Elemental abundances of the supergiant stars σ Cygnus and η Leonis
• Main-sequence Turnoff Stars as Probes of the Ancient Galactic Relic: Chemo-dynamical Analysis of a Pilot Sample
• Full abundance study of two newly discovered barium giants
• Study of The Abundance Patterns in The Metal-Poor Stellar Stream
• Chemical analysis of carbon stars in the Local Group: I. The Small Magellanic Cloud and the Sagittarius dwarf spheroidal galaxy
• Neutron-Capture Elements in the Double-Enhanced Star HE 1305-0007: a New s- and r-Process Paradigm
• Measurements of neutron-induced reactions in inverse kinematics and applications to nuclear astrophysics
• Footprints of the weak s-process in the carbon-enhanced metal-poor star ET0097
• Explosive nucleosynthesis in core-collapse supernovae
• Astrophysical Origins for the Unusual Chemical Abundance of the Globular Cluster Palomar 1
• The Origins of Neutron-capture Elements In Globular Cluster M22
• Silicon and Strontium abundances of very metal-poor stars determined from near-infrared spectra
• Barium lines in high-quality spectra of two metal-poor giants in the Galactic halo
• New Level Resolved Ground and Excited State Pb III, IV, V & VI Photoionization Cross Sections for Heavy Metal Subdwarf Modeling
• The R-Process Alliance: A Nearly Complete R-Process Abundance Template Derived from Ultraviolet Spectroscopy of the R-Process-Enhanced Metal-Poor Star HD 222925
• CEMP-s and CEMP-s/r stars: last update