Lab Write-Up 11 - 20 4 To clarify the meaning of the H-R...

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Chapter 11: Photometry of the Pleiades Cluster Report by: Nick Orozco Section 5 14 April 2008 Lab Partner: Colin Smolinsky
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Nick Orozco Section 5 14 April 2008 Lab Partner: Colin Smolinsky Chapter 11: Photometry of Pleiades Cluster Purpose: The purpose of this lab was to better determine the distance of a star to determine the distance to a star. During the lab procedure, we calculated the magnitudes of B and V of several stars in the Pleiades Cluster then proceeded to develop an H-R Diagram of the data. We then created an Absolute Magnitude graph using the parallax method, in order to compare the two graphs. Data: See Attached Graphs Lab Analysis and Questions: Note: For math, please refer to the attached sheet with the work written out. 1. D = 10 x 10 1.1 ] D = 125. 89 parsecs 2. 125.89 parsecs = 410.10 light years 125.89 parsecs = 3.89 x 10 18 m 3. [6.5 + 4.5]… = 36% [6.5 + 5.5]… = 16% [5.5 + 4.5]… =
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Unformatted text preview: 20% 4. To clarify the meaning of the H-R graph, the hottest stars we graphed have absolute magnitudes and negative color indexes. Meanwhile, the cooler stars that were graphed have a bluer color to them and are fainter. Using this information as reference, we can conclude that the Pleiades cluster contains a core of young to middle-aged stars with color indexes averaging between 0 and 1 and absolute magnitudes between 0 and 10. 5. Absolute Magnitude: 4.85 6. Sun’s color index at a 4.85 absolute magnitude: 0.65 Spectral class: G 7. We could determine the brightness by referencing its color index and absolute magnitude on the graph. Thus, we can conclude that the Sun would be as bright as the other stars in the cluster judging by its location on the graph. Furthermore, the Sun would be visible at night with the rest of the Pleiades Cluster....
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