Wednesday, September 26, 2012
12:00 pm
IPAC LCR Morrisroe Astroscience Laboratory
IPAC Astronomy Lunch Seminar
Series:IPAC Astronomy Lunch Seminar
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 Luisa Rebull rebull@ipac.caltech.edu at x4565
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