velocity-metallicity relation

The velocity-metallicity relation is the correlation between low metallicity and high velocity dispersion within the local Milky Way. Low metallicity is associated with older stars, formed before supernovae and short-lived stars increased the metallicity of the molecular clouds, and stellar age has also been determined to be related (age-velocity-metallicity relation).

The velocity-metallicity relation can be demonstrated by peculiar velocity diagrams of a chosen group of stars of some given metallicities and spectral types, that plot the peculiar velocity components based on the neighborhood of the given stars: one component radial to the galaxy and the other component perpendicular to the first, within the galactic plane,