Code

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!

• Install it from Github
• Find the documentation here
• Read the paper on the methods here

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 the massive elliptical galaxies in Gountanis et al. 2024
• Download ChemWAF from Github
• Download fanCE from Github

Chempy

Flexible one-zone chemical enrichment model developed in Rybizki et al. (2017).

• Read more about it here
• Download it from Github

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.

• Download it from Github
• Play with it online