Astr 222 Jan 26 2005: Metallicity, stellar populations and the distance scale in the Milky Way  

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Metallicity and color-mag diagrams

White Dwarf and giant spectra

Chemistry in the Milky Way

Question: Why might there be a correlation to age and metallicity?

Star Clusters and Stellar populations

Which cluster is most likely metal poor?

Globular Cluster data

Spatial distribution of globulars

Measuring Distances

Stellar pulsation

Cepheid Variables

Compress a star...

Instability strip

Cepheid variables and the distance scale

Cepheid instability strip

period-luminosity charts

The Distance Ladder

Main sequence fitting

Main sequence fitting diagram