Star Clusters and Stellar Evolution

Star clusters are elegant and pretty things to see in a telescope, but that's not the whole story. We know that stars must change as they run out of hydrogen to burn in their cores, and those deep changes in the core of stars have observable consequences. So, we use HR Diagrams to map the changes and enormous computer simulations to test the physics. This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter.
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Hertzsprung-Russell diagram: en.wikipedia.o...
Hyades Star Cluster: en.wikipedia.o...)
Open Clusters: en.wikipedia.o...
Globular Clusters: en.wikipedia.o...
NOAO image gallery: www.noao.edu/k...
The STScI Digitized Sky Survey: archive.stsci.e...
M67 on APOD: apod.nasa.gov/a...
M80 Hubble Space Telescope: hubblesite.org/...
My lab on the Hubble Legacy Archive Educational Materials: hla.stsci.edu/h...
Stellar Evolution: en.wikipedia.o...
Main Sequence Lifetime: en.wikipedia.o...
Main Sequence Turn-off: en.wikipedia.o...
The Hertzsprung-Russell Diagrams of Star Clusters: www.astrophysic...