Astronomy 104  Fall 2007

Review of Stellar Properties  Due: Wednesday, Sept. 26 in class

This exercise is designed to help you see the connections between all the different properties of stars that we can deduce from some simple measurements. The goal of this exercise is to construct a diagram showing the connections between what we can measure and what we can learn about the basic properties of stars. Start by making lists, then try to draw a diagram connecting the items in your lists. First identify the direct observations we can make about a star (this is a short list!). Then list the individual things we can deduce from those observations. Next, list properties that we can determine by combining two or more individual properties. For example, knowing flux and luminosity we can determine the stars radius. (What does it take to know its flux? How do we measure that? What does it take to know its luminosity? How do we determine that?) Now that you have listed all the stellar properties and the direct observations that lead to them, draw a diagram that shows in a graphical, visual way how the pieces are connected. We have learned a lot about the basic properties of stars, and there are lots of connections between things. Your job in this assignment is to draw a map making connections between the various pieces. Your diagram might resemble a flowchart, but don’t feel limited to that form. There is no right or wrong way to make this diagram. The point is to help you organize your thoughts and understanding of the connections between what we measure and what we can determine about stars. Consider using colors to help organize your diagram. Be creative with your diagram.