A Stellar Population is a grouping of Milky Way stars based upon their
- Population III Stars (Metal-free Stars) - stars with no metallicity: early and high-mass.
- Population II Stars (Metal-poor Stars) - stars with low metallicity: next generation stars.
- Population I Stars (Metal-rich Stars) - subsequently-formed (recent/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