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| Paper: |
Chemical Abundance Scale of Giant and Dwarf Stars |
| Volume: |
472, New Quests in Stellar Astrophysics III: A Panchromatic View of Solar-like Stars, With and Without Planets |
| Page: |
105 |
| Authors: |
Ferreira, L. D.; Pasquini, L.; Smiljanic, R. |
| Abstract: |
When comparing chemical abundances of main-sequence and evolved stars it is
assumed that they share the same scale. Differences in the abundances of these
stars are found and, if real, they have important consequences for planet
formation theories and chemical evolution of the Galaxy. Thus, it is crucial to
investigate whether the metallicity discrepancy between dwarfs and giants is
real or produced by systematic errors in the analysis. In this conference, we
present the preliminary test to establish a reliable abundance scale to be
used in for both giant and dwarf stars. To achieve that, we selected stars
of Hyades open cluster assuming that they share the same chemical composition.
The giant stars of this cluster have both (i) high resolution spectroscopic
database from HARPS, and (ii) direct measurements of the angular diameter
by interferometry. We aim to perform a 1D-LTE spectroscopic analysis associated
with a benchmark test to investigate the relevance of non-LTE effects. Herein,
we show the preliminary test applied for the giant stars. |
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