Astr 222 January 10, 2005:  

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High Mass evolutionary tracks

Question: what nuclear reactions are going on?

Question: What is the brighter sequence?

Question: Where do we find binary systems on HR diagrams?

an Open Cluster

Open cluster NGC 3293

evolutionary tracks and ages

Question: where are the stars that evolved off the main swquence?

Question: How might the HR diagram of a galaxy be different?

CMD of Leo I

Leo I with ages

Star formation rates of Leo I