Metallicity and Ionization Balance in a Very Metal-Poor Galactic Halo Turnoff Star

Details Metallicity and Ionization Balance in a Very Metal-Poor Galactic Halo Turnoff Star Metallicity and Ionization Balance in a Very Metal-Poor Galactic Halo Turnoff Star

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542404a&link_type=abstract

American Astronomical Society, AAS Meeting #215, #424.04; Bulletin of the American Astronomical Society, Vol. 42, p.331

Astronomy and Astrophysics

Astronomy

Scientific paper

We have derived the iron metallicity of the very metal-poor main-sequence turnoff star HD 84937, using many Fe I and Fe II transitions over the largest wavelength range to date, 2300-7500A. The high resolution spectra for this work were taken with the Lick 3.0m Hamilton, the Magellan MIKE, and the Hubble Space Telescope STIS echelle spectrographs. From a standard LTE analysis, we derive metallicities for HD 84937 from both Fe I and Fe II lines that are consistent with literature values, [Fe/H] -2.2. These are the first results in our project to provide new abundances for many Fe-peak elements from their neutral and ionized species using both visible and UV wavelength data. HD 84937 provides a benchmark for assessing the departures from LTE ionization equilibria in cooler, lower gravity very metal-poor stars.
This work has been supported by The University of Texas Astronomy Department Cox Undergraduate Excellence Fund to MAA, NSF grants AST-0607708, AST-0908978 to CS and AST-0707447 to JJC, and NASA Grant NNX08AQ09G to JEL.

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