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H-R_diagram_pre-lab_02-17-10

H-R_diagram_pre-lab_02-17-10 - H-R Diagram pre-lab Read the...

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H-R Diagram pre-lab Read the following material, then look up the star you have been assigned to find its position on the H-R diagram. Answer the questions at the end of the pre-lab and type your answers into the submission box on the H-R pre-lab assignment box on Blackboard. When astronomers began to measure properties of stars and categorize them, they discovered that stars come in a wide variety of forms, large and small, bright and dim, massive and not so massive. In order to find relationships among the various forms of stars, astronomers devised ways to arrange and study the information they collected about the stars. Ejnar Hertzsprung (Danish) and Henry M. Russell (American) introduced the H-R Diagram early in the 20 th century. In its simplest form, the H-R diagram is a plot of the absolute magnitudes of stars versus their spectral types. The absolute magnitude is placed on the vertical axis and the spectral type is listed along the horizontal axis. The vertical scale is usually written with the absolute magnitude
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