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 ?
('Balmoral' or the 'Company') (TSX: BAR; OTCQX: BALMF) announced that, following the recent discovery of precious metal-rich nickel sulphide mineralization on its RUM North Property, it has acquired by staking three new nickel sulphide targets similar to the intrusion hosting the Bluenose discovery.
Consumption of such metal-rich plant may contaminate the human body.
We will consider resource extraction from the full range of wastes currently in UK waste repositories including industrial and commercial waste (anticipated to be metal-rich), incinerator and fuel ash, mineral wastes and municipal wastes to examine the idea of in situ leaching.
To reproduce our neighbor's massive and metal-rich stellar halo, the simulations require a major collision within the past 5 billion years, with disrupting effects continuing until 2 billion years ago.
Analysing the central star, with the participation of top theoretical astrophysicists, the authors found that it is surprisingly cool and metal-rich, and is evolved from a low-mass progenitor star which has a mass 1.1 times of the Sun.
Giant galaxies like the NGC 1277 generally contain both metal-rich (red in appearance) and metal-poor (blue in appearance) globular clusters.
Environmental pollution caused by mining activities includes large amounts of particulate and dust, solid wastes, soil pollution, metal-rich effluents, and acid mine drainage (AMD).
"Most stars that are as metal-rich as Kronos have all the other elements enhanced at a similar level, whereas Kronos has volatile elements suppressed, which makes it really weird in the general context of stellar abundance patterns," she said.
Karbe, In Vitro Suppression of Thymocyte Apoptosis by Metal-Rich Complex Environmental Mixtures: Potential Role of Zinc and Cadmium Excess, Sci.
It can be used in the treatment of all acidic wastewaters and will successfully treat both the metal-rich wastewaters as well as the phosphate-rich ones, presenting downstream cost-effectiveness in terms of sludge disposal and maintenance costs.
Achieving this series are metal-rich and strong tradition of metalworking in Iraq, the Islamic world's most precious metalworks that was produced within the Empire, guaranteed.
"Phytoremediation" describes how hyperaccumulator plants remove heavy metals from contaminated soils, while "phytomining" refers to how hyperacccumulator plants grow and harvest to recover commercially valuable metals in plant shoots from metal-rich sites.

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