Astrophysics (Index)About

velocity-metallicity relation

(higher stellar velocity correlates with lower metallicity)

The velocity-metallicity relation is the correlation between low metallicity and high velocity dispersion within the local Milky Way. These also have a relation with age (thus, the age-velocity-metallicity relation, AVMR): lower metallicity is associated with older stars that formed before supernovae increased the metallicity of molecular clouds.

The velocity-metallicity relation can be demonstrated by peculiar velocity diagrams of a chosen group of stars of some given 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. This reveals two populations, that show a correlation with metallicity of the individual stars.


A velocity-metallicity correlation has also been found among high-redshift galaxies: a galaxy's overall stellar velocity indicated by line broadening is correlated with the galaxy's overall metallicity.


(kinematics,Milky Way,stars,relation)
Further reading:
https://web.njit.edu/~gary/321/Lecture18.html
https://ui.adsabs.harvard.edu/abs/2008ApJ...684..287I/abstract
https://ui.adsabs.harvard.edu/abs/2013A%26A...558A...9M/abstract
https://ui.adsabs.harvard.edu/abs/2017MNRAS.467.1154S/abstract

Referenced by pages:
age-metallicity relation (AMR)
age-velocity-dispersion relation (AVR)

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