old stellar population
porineš-e setâre-yi-ye kohan
Fr.: population stellaire vielle
A population of stars in a stellar system that have definitely left the → main sequence.
Fr.: population stellaire
stellar population synthesis
handâyeš-e porinešhâ-ye setâre-yi
Fr.: synthèse de poupulations stellaires
A theoretical model that reconstructs the integrated spectrum of → stellar populations from an empirical library of stellar spectra containing the range of types expected to be present in the sample. The light received from a given galaxy is emitted by a large number of stars that may have different masses, ages, and metallicities. Stellar population synthesis models are tools for interpreting the integrated light that we observe from the galaxies.