metallicity

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metallicity

(met-ă-liss -ă-tee) (metal abundance) Symbol: Z . The fraction by mass of metals in a star, cluster of stars, or in some other astronomical entity. Since metals are produced by nucleosynthesis in stars, the metallicity of an object or class of objects depends on when it was formed: objects of later origin in general have a higher metallicity. Metallicity is determined by photometry or high-resolution spectroscopy, and is usually expressed relative to solar metallicity (see cosmic abundance), and as the ratio of iron to hydrogen, Fe/H. See also population I, population II.
References in periodicals archive ?
The NHP horizontal machining center series-including the NHP 4000 and NHP 5000-was developed by Doosan Machine Tools specifically to address high-metal removal applications.
Although our focus was on teaching soldiers better ways to find low-metal mines, these techniques are also applicable to the much easier to detect high-metal mines.
In practical terms, this means that the detector is able to detect high-metal mines from a distance of several feet, but low-metal mines can be detected from only a few inches (see Figure 1).
High-metal mines produce footprints that extend as far as 1 meter away from the mine's center.
Close says the machine is best used on a high-metals concentrate stream, such as a post-shredder Zorba grade.