Stellar Populations, colors, models
Stellar Synthesis Population Models:
Obtain spectra of all spectral types over wide range of
wavelengths (use models to fill gaps).
Combine spectra according to an initial mass function.
Age the starburst by removing spectra of the most massive
stars first, according to their lifetimes, etc.
Add together combinations of starbursts (e.g., different
instantaneous bursts, or according to some prescription like
constant star formation or exponentially decaying star
formation.
A couple of homework problems explore this topic.