H-R_diagram_lab_02-17-10 - The Hertzsprung-Russell Diagram:...

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The Hertzsprung-Russell Diagram: Stellar Evolution and Nucleosynthesis Purpose: Understand the H-R Diagram and how it can be used to predict stellar evolution and nucleosynthesis. Practice constructing graphs by hand. Develop ways to construct graphs that convey the meaning of the data you want to display. Procedure: Part 1 Like the periodic table of the elements, the H-R diagram is very dense with information. Most people have experience with plotting measurements as a bar or line graph in which the horizontal axis is time and the vertical axis represents an amplitude such as stock price, height, or mass. However, sometimes communicating data is made easier when time is not plotted in the horizontal or vertical axis. To prepare for interpreting the H-R diagram, you will create a few plots that represent familiar data in an unconventional way. On an 8.5x11 inch sheet of paper, draw (1) A pair of plots that show how you expect your weight and yearly income to vary with time over your entire lifetime. The horizontal axis for each must be time. The level of detail must be such that a person can determine a value of weight, yearly income, and age at five-year intervals. (2) A single plot that shows the same information as in (1) (weight, yearly income, and your age) except this time make the horizontal axis time and the vertical axis income. The level of detail must be such that someone that looks at this plot can determine a value of weight, yearly income, and age at ten-year intervals, starting at birth. Do not be concerned with using exact values. You will need to think about how you can display relationships over time using different colors, shapes, or whatever makes sense. The intent is to convey information to the reader in a compact, understandable form. (3) Label all graphs with titles, axis labels and a legend. In grading the graphs your instructor will look for legibility and whether the trends make sense (use a scrap piece of paper to create a draft, then make a legible final copy). If there is an unusual feature in the plot, justify it with a footnote. Part II: As with the second graph you created in part I, the H-R diagram contains a lot of information in a single space. To get a better idea of what kinds of things you may find
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as you study the diagram you will use a program on your computer to look up information about various stars. Start the H-R Calc program by selecting
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This note was uploaded on 02/06/2011 for the course ASTR 114 taught by Professor Staff during the Spring '08 term at George Mason.

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H-R_diagram_lab_02-17-10 - The Hertzsprung-Russell Diagram:...

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