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HD 209562


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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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观测天体数据

星座:寶瓶座
右阿森松:22h04m49.73s
赤纬:-23°43'46.4"
视星:8.901
距离:59.524 天文距离
右阿森松适当运动:-39.8
赤纬适当运动:6
B-T magnitude:9.678
V-T magnitude:8.966

目录:
适当名称   (Edit)
HD 1989HD 209562
TYCHO-2 2000TYC 6954-664-1
USNO-A2.0USNO-A2 0600-43936435
HIPHIP 108996

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