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Planetarium Activity

Turn off the daylight and horizon displays. Use the “Selection” button and click on “Find.” In the window, type in Pleiades and then click “Find.” Zoom in on the Pleiades until the field of view is about 3°. Click on “H-R” button on the vertical toolbar to display the H-R diagram of the cluster. Use the Selection Tool to point at various stars in the Pleaides. The red dot on the H-R diagram display shows the position of the star at which you are pointing. Keep looking until you find the hottest main sequence star in the cluster. Double click to find the luminosity and temperature of the hottest star. Using Table 19.1 and Equation 19.5, estimate the age of the Pleiades from the properties of the hottest main sequence star in the cluster.

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