Astronomy lab
Classifying Stars – An introduction to the H-R Diagram Student Learning Objectives: ● Organize and categorize stars based on similarities and patterns. Materials: ● The file “star_data.pdf” ● A piece of scratch paper to organize and categorize stars ● If possible, you may want to print or replicate them so that you can cut and move them around. Only use the stars on the data file to answer your questions. Part I: Classifying and Categorizing Stars Guiding question: In a universe of billions of stars in billions of galaxies, how can we identify them? – Each star has a name, a color, a temperature, and a luminosity value. – Luminosity is compared the Sun’s luminosity such that a value greater than 1 means it is that many times the Sun’s luminosity. A value less than one means it is that fraction of the Sun’s value. – Become familiar with the stars and write down what you are noticing. What general observations can you make of all of the stars ? 1. 2. 3. 4. The goal here is to find PATTERNS amongst the stars, and determine common themes. 1. Sort the stars by color and list 3 observations (for example, of all the stars that are the same color, what do you notice? Or all different and note differences): 2. Sort the stars by temperature and list three observations: 3. Sort the stars by size and list three observations: 4. Sort the stars by luminosity. Notice that some stars have a luminosity of less than 1 – this means that the star has a lower luminosity than our Sun. List your observations about this arrangement: 5. In the first four questions you have sorted stars by color, temperature, size, and luminosity. What other ways can you think of to classify stars? 6. What can we say about medium sized stars? 7. What can we say about large stars? 8. Name a star that is cool and sim: __________ temp _______ lum ______ 9. Name a star that is cool and bright: __________ temp _______ lum ______. 10.Name a star that is hot and dim: ____________ temp _______ lum ______. 11.Name a star that is hot and bright: _________ temp _______ lum _______. What does color indicate about temperature? What does a star’s temperature indicate about its luminosity? What other trends and relationships can you determine? HR Diagram: Investigate the axis and information on the HR Diagram below. Identify where you would place each of the stars from this lab. For example, find Mira. If you know the temp and the luminosity (related to the sun) you can place it appropriately on the plot. Place the stars in the correct location on the plot below, by adding their NAME and COLOR.
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