Accurate abundance patterns of solar twins and analogs. Does the anomalous solar chemical composition come from planet formation?

Details Accurate abundance patterns of solar twins and analogs. Does the anomalous solar chemical composition come from planet formation? Accurate abundance patterns of solar twins and analogs. Does the anomalous solar chemical composition come from planet formation?

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...508l..17r&link_type=abstract

Astronomy and Astrophysics, Volume 508, Issue 1, 2009, pp.L17-L20

Astronomy and Astrophysics

Astrophysics

36

Stars: Abundances, Sun: Abundances, Planetary Systems

Scientific paper

We derive the abundance of 19 elements in a sample of 64 stars with fundamental parameters very similar to solar, which minimizes the impact of systematic errors in our spectroscopic 1D-LTE differential analysis, using high-resolution (R≃60 000), high signal-to-noise ratio (S/N≃200) spectra. The estimated errors in the elemental abundances relative to solar are as small as ≃0.025 dex. The abundance ratios [X/Fe] as a function of [Fe/H] agree closely with previously established patterns of Galactic thin-disk chemical evolution. Interestingly, the majority of our stars show a significant correlation between [X/Fe] and condensation temperature (T_C). In the sample of 22 stars with parameters closest to solar, we find that, on average, low TC elements are depleted with respect to high TC elements in the solar twins relative to the Sun by about 0.08 dex (≃20%). An increasing trend is observed for the abundances as a function of TC for 900Figure 1 and Tables 1-4 are only available in electronic form at http://www.aanda.org

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