How SFRIs vary with methods of sampling the IMF and duplicity

Understand

Using our new Binary Population and Spectral Synthesis (BPASS) code we explore the affect of binary populations on the integrated spectra of galaxies.

• We also explore the interplay of binary populations and a varying maximum stellar mass.
• We compare our synthetic populations to observations of H$\alpha$ emission from isolated clusters and H$\alpha$ and FUV observations of galaxies.
• We find that observations tend to favour a pure stochastic sampling of the initial mass function although the evidence is not significant.