Figure 1 illustrates the color magnitude diagram (CMD) for the Carina Dwarf along with
the interpreted star formation history from isochrone fifitting to the CMD.
1 Get Set Up
1. Update your clone of the Class GitHub Repo (git pull)
2. Under InClassLabs/InClassLab4/ you should fifind a template Jupyter notebook and
.py fifile along with a series of .txt fifiles.
3. Copy these fifiles into your own repository, following a similar folder naming convention.
• The text fifiles are isochrones for a single age population, the age is indicated by
the number in the fifile name.
• The Isochrones come from http://stellar.dartmouth.edu/models/isolf new.html
They assume [Fe/H] = -2.0, α/Fe=-0.2.
• The template code sets up an example of reading in one of the isochrone fifiles and
plotting it.
2 Q1
Modify the template fifile of your choice to plot isochrones that correspond to the inferred
star formation episodes (right panel of Figure 1) to recreate the dominant features of the
CMD of Carina (left panel of Figure 1).
3 Q2
From the data could there be younger populations than what the Tolstoy review article
suggests?
4 Q3
What do you think could cause these bursts of star formation?
1Figure 1: From Tolstoy+2009 ARA&A 47 review paper about dwarf galaxies.
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