A Stellar Population is a grouping of Milky Way stars based upon their
- Population III (Metal-free) - stars with no metallicity: early and high-mass.
- Population II (Metal-poor) - stars with low metallicity: next generation stars.
- Population I (Metal-rich) - current stars, e.g., the Sun.
These show a qualitative Age-Metallicity Relation (AMR).
A quantitative relation has been theorized, i.e., that ages
could be derived from observed metallicity, but I believe
this is not currently considered reliable.
Epoch of Reionization (EOR)
Stellar Population Synthesis (SPS)
Stellar Population Synthesis Code