Software
Stellar Spectroscopy
Chem-I-Calc: The Chemical Information Calculator
Chem-I-Calc is an open-source Python package for evaluating the chemical information content of resolved star spectroscopy. It takes advantage of the Fisher information matrix and the Cramér-Rao inequality to quickly calculate the Cramér-Rao lower bounds (CRLBs), which give the best theoretically achievable precision from a set of observations. Use it to quickly forecast the expected chemical abundance precision of your upcoming observation, instrument, or survey!
Galactic Chemical Evolution
ChemWAF & fanCE
Python packages wrapping the analytic chemical evolution model from Weinberg et al. (2017).
- Read about its application to the ultra-faint dwarf galaxy Eridanus II in Sandford et al. 2024
- Read about its application to massive elliptical galaxies in Gountanis et al. 2025
- Download ChemWAF from GitHub
- Download fanCE from GitHub
Chempy
Flexible one-zone chemical enrichment model developed in Rybizki et al. (2017).
Chempy-Widget
Interactive IPython widget created for Jan Rybizki’s Chempy. This is a great tool for building an intuition for how a system’s star formation history is imprinted on its chemical composition.