Metal-rich, Metal-poor: Updated Stellar Population Models for Old Stellar Systems

Understand

We present updated stellar population models appropriate for old ages (>1 Gyr) and covering a wide range in metallicities (-1.5<[Fe/H]<0.3).

• These models predict the full spectral variation associated with individual element abundance variation as a function of metallicity and age.
• The models span the optical-NIR wavelength range (0.37-2.4um), include a range of initial mass functions (IMFs) and contain the flexibility to vary 18 individual elements including C, N, O, Mg, Si, Ca, Ti, and Fe.
• To test the fidelity of the models we fit them to integrated light optical spectra of 41 Galactic globular clusters (GCs).