Use information created by the The Science Museum of Virginia http://cse.ssl.berkeley.edu/segwayed/lessons/startemp/l6.htm to answer the following questions on a separate sheet of paper.
- What variables does the HR diagram compare?
- Describe why it is possible to relate the temperature of a star to its luminosity, or brightness.
- Why is measuring the luminosity of stars difficult?
- What star serves as a standard of comparison against which the luminosity of other stars is measured?
- Sketch and label the HR Diagram. Make sure to label the axes, the main sequence, white dwarves, giants, and super giants.
- What do the letters at the bottom axis of the HR Diagram represent?
- What are the four important things to note about the HR Diagram?
- Are blue stars hotter or cooler than red stars?
- If a star has a luminosity of ten thousand (10,000), how many times brighter is it than the sun?
- How does the brightness of white dwarfs relate to that of the sun?
Go to the next section of the same website to answer the following.
- Describe the general trend between temperature and luminosity that the Main Sequence shows.
- Why do giant stars differ from stars in the Main Sequence?
- How do white dwarf stars differ from stars in the Main Sequence?
Go to the next section of the same website to answer the following questions.
- Describe stars A, B, C, and D in terms of both their brightness and temperature.
- The sun is a Main Sequence star. The HR Diagram tells us the luminosity of the sun. Using this information and the HR Diagram, determine what the sun’s classmight be as a star.