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 ?
Previous studies have shown that metallicity plays a role in planet formation, but it's unclear how.
Titled "The Influence of Metallicity on Stellar Differential Rotation and Magnetic Activity," (http://iopscience.
Aguado's team found that J0815+4729 has a metallicity [Fe/H] of at least -5.
In addition, we will study how accretion is affected by metallicity by studying young solar-like stars in the low metallicity Magellanic Clouds.
We present a review of the literature and new photometry of the cluster looking specifically at potentially new members of the system and present plans for a spectroscopic campaign to determine metallicity of the cluster.
I'm not simply talking about the metallicity or glossiness of the paint, but its essence seems to extend well beyond the surface of the steel, much like an aura.
His findings are consistent with Eremets' new phase, but Silvera disputes Eremets' speculations of metallicity.
Ch] merger channel), dependently on detailed conditions such as rotation, magnetic fields, metallicity and the host galaxy population.
Since a star and its planets form from the same disk of material, the metallicity of a star reflects the composition of the protoplanetary disk.
Our analysis revealed a significantly subsolar metallicity (Me/H ~ -0.
The study shows that small planets do not discriminate and form around stars with a wide range of heavy metal content, including stars with only 25 percent of the sun's metallicity.
A dozen splinter sessions filled in the innovation niches with such topics as ultracool dwarf science from wide field multi-epoch surveys, frontiers in X-ray astronomy, and determining the metallicity of low-mass stars and brown dwarfs.