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How accurately are the compositions (metallicities) of the Encyclopedia stars known?

April 26, 2017accurately compositions encyclopedia known stars

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How accurately are the compositions (metallicities) of the Encyclopedia stars known?

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Metallicity is somewhat difficult to measure. There are several ways of measuring it, the best (and most direct) being a detailed analysis of the spectral lines of iron and hydrogen. Estimates of the uncertainty vary, but uncertainties of 25% appear to be typical.