Tuesday, September 11, 2012
4:00 pm
Cahill, Hameetman Auditorium – Cahill Center for Astronomy and Astrophysics

Astronomy Tea Talk

The Hypatia Catalog - Stellar Abundances in the Solar Neighborhood'
Natalie Hinkel, NExSci
I have compiled spectroscopic abundance determinations for 46 elements across 2836 stars within 150 pc of the Sun from 50 literature sources to produce the Hypatia Catalog. The goal of the Hypatia Catalog is to examine nearby stars and regions in the solar neighborhood for chemical abundance trends which may provide additional information, for example, in the search for exoplanets. I find that the element abundance maps of Hypatia stars suggest [1] stars in the solar neighborhood are consistent with solar abundances, [2] the evolutionary history of each element is consistent with mean chemical evolution models, [3] there are no significant statistical correlations in the abundances with respect to position, radial distance, or velocity - suggesting the solar neighborhood is well mixed. For the 215 confirmed exoplanet hosts found within the Hypatia Catalog, I find that exoplanet hosts are enriched in [Fe/H] as compared to non-hosts, per the Planet-Metallicity Correlation. However, this trend does not hold for any of the other elements found within the catalog. There also appears to be higher average abundance of bio-essential elements (C, N, O, Mg, Si, and S) in smaller stellar masses (M less than 1.0 M_Sun) and in stars hosting multiple planets.
Contact Gina Armas gina@caltech.edu at 4671
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