Karen M. Lewis
Decoding the message from meteoritic stardust silicon carbide grains
Lewis, Karen M.; Lugaro, Maria; Gibson, Brad K.; Pilkington, Kate
Authors
Maria Lugaro
Brad K. Gibson
Kate Pilkington
Abstract
SiC mainstream grains are presolar grains believed to form in the envelopes of carbon rich asymptotic giant branch (AGB) stars with masses between 1.5 and 3 solar masses. These grains represent a conundrum as the 29Si and 30Si abundances indicate that they formed in stars of super-solar metallicity, before the solar system formed. To shed light on this problem, we use silicon isotopic abundances to derive an age-metallicity relation for the stars believed to have produced the SiC mainstream grains. For 2732 mainstream SiC grains listed in the Presolar Grain Database, we use the 29Si abundances with the latest galactic chemical evolution (GCE) models to derive [Fe/H], and 30Si abundances along with the models of Zinner et al. (2006) to determine an approximate birth age for the parent AGB star. Comparing our age-metallicity relation with observational relationships derived for nearby stars, we find that the spread of [Fe/H] is in agreement, but the mean [Fe/H] in our relation is higher by 0.2 dex. We propose that this difference is because stars with higher [Fe/H] produce more dust and thus are over-represented in our age metallicity diagram, a finding consistent with previous published works. This result offers a solution for the long-standing problem of silicon in Stardust SiC grains, confirms the necessity of coupling chemistry and dynamics in simulations of the chemical evolution of our Galaxy, and constrains the modelling of dust condensation in stellar winds as a function of the metallicity.
Citation
Lewis, K. M., Lugaro, M., Gibson, B. K., & Pilkington, K. (2014). Decoding the message from meteoritic stardust silicon carbide grains. AIP conference proceedings, 1594, 301-306. https://doi.org/10.1063/1.4874086
Journal Article Type | Conference Paper |
---|---|
Conference Name | ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2013: Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG12) |
Conference Location | Tsukuba, Japan |
Acceptance Date | Oct 1, 2014 |
Online Publication Date | Feb 17, 2015 |
Publication Date | 2014 |
Deposit Date | Oct 5, 2018 |
Publicly Available Date | Oct 8, 2018 |
Journal | ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2013 |
Print ISSN | 0094-243X |
Electronic ISSN | 1551-7616 |
Publisher | American Institute of Physics |
Peer Reviewed | Peer Reviewed |
Volume | 1594 |
Pages | 301-306 |
DOI | https://doi.org/10.1063/1.4874086 |
Public URL | https://hull-repository.worktribe.com/output/541813 |
Publisher URL | https://aip.scitation.org/doi/abs/10.1063/1.4874086 |
Files
Article
(1.1 Mb)
PDF
Copyright Statement
©2014 AIP Publishing LLC
You might also like
Chemical evolution of fluorine in the Milky Way
(2022)
Journal Article
Downloadable Citations
About Repository@Hull
Administrator e-mail: repository@hull.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search