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The log of the ratio between the ratios of the observed Fe and H quantities in a star and the same ratio in the Sun. This is a very important quantity that is often used in astronomy as an indicator of the age of a star.

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  • metallicity (en)
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  • The log of the ratio between the ratios of the observed Fe and H quantities in a star and the same ratio in the Sun. This is a very important quantity that is often used in astronomy as an indicator of the age of a star. (en)
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