You will be using Table 1 and Table 2 to plot the 20 nearest and 20 brightest stars on the attached HR diagram. The following tips will be helpful when graphing stars;
Use a circled dot (o) to graph each of the brightest stars as seen from Earth (listed in Table 2) on the diagram. Show stars that appear on both tables using a square (). Please sign you name on your graph and include the date.
Table 1. The 20 Nearest StarsNameDistance (Parsecs)Temperature KAbsolute MagnitudeAlpha Centauri
The 20 Brightest Stars
Type your answers to the below questions in your lab report. Based on the results of the HR diagram you have created, answer the following questions. For all answers use complete sentences. After you have completed the below questions, scan or take an image of your HR graph and insert it into your lab report, making sure that it is clear and readable. Make sure to provide any/all sources used.
Follow this link to the Hertzsprung-Russell Diagram Explorer simulation. (Please try using Explorer, or Firefox browsers. Note that when using these browsers you will need to allow Adobe-Flash to run, and there might be plugins as well. This is very safe & trusted software. For example, look up in the web address bar and see if the plug-in manager has come up example, and you might need to click on that to allow the app to open. The direct site you are going to is: HR Simulation .)
When you open the simulation you will see an image of two stars, one labeled star and one labeled sun. The default setting when you open the simulation is for the star to have the same settings as the Sun for all values of temperature, luminosity, and radius. (T = 5,800K, L = 1sun, R = 1 sun). You can change the settings in various ways, clicking on the slider bars for temperature and luminosity, or clicking on various spots on the HR diagram to move the red crosshair shown on the diagram. (Below is a screenshot of the Hertzsprung-Russell Diagram Explorer.)
To start this activity check all four of the boxes under options so they will be seen on the HR diagram. You will now be asked to navigate through the simulation and answer questions on what you see. You will also be asked questions for which you will need to consult other sources.
The next series of questions will ask you to move the red crosshairs on the diagram to different spots within the diagram to understand the evolution of our Sun and the changes that it will experience with time.
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