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Accurate abundance patterns of solar twins and analogs. Does the anomalous solar chemical composition come from planet formation?
We derive the abundance of 19 elements in a sample of 64 stars withfundamental parameters very similar to solar, which minimizes the impactof 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 abundancesrelative to solar are as small as ?0.025 dex. The abundance ratios[X/Fe] as a function of [Fe/H] agree closely with previously establishedpatterns of Galactic thin-disk chemical evolution. Interestingly, themajority of our stars show a significant correlation between [X/Fe] andcondensation temperature (T_C). In the sample of 22 stars withparameters closest to solar, we find that, on average, low TCelements are depleted with respect to high TC elements in thesolar twins relative to the Sun by about 0.08 dex (?20%). Anincreasing trend is observed for the abundances as a function ofTC for 900
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Observation and Astrometry data
| Constellation: | Aquarius |
| Right ascension: | 22h01m14.72s |
| Declination: | -19°18'45.8" |
| Apparent magnitude: | 8.945 |
| Distance: | 63.412 parsecs |
| Proper motion RA: | 110.7 |
| Proper motion Dec: | -15.3 |
| B-T magnitude: | 9.737 |
| V-T magnitude: | 9.011 |
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