metallicity

(redirected from Stellar metallicity)

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.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
Recent examples of using integral field capabilities to study nearby disk galaxies show the full potential of this technique to assess nebular abundances and stellar metallicity [28].
"So far there are only very few planetary companions detected around stars with low stellar metallicity," said Johny Setiawan, astronomer who led this research at the Max-Planck Institute for Astronomy.
We find that classical evolution paradigm of gradual enrichment and dynamical heating of the Galactic disk seem to fail several of the standard tests related to the stellar metallicity distribution, age-metallicity relation, and age-velocity relation.
In a companion article (Sanchez-Blazquez [51] in prep.), we analyse the radial gradient of stellar metallicity, where we have found consistent results.