Download H-R Interactive Lab Sheet

Hertzsprung-Russell Interactive Lab
http://sunshine.chpc.utah.edu/labs/star_life/hr_diagram.html
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Directions: Visit the website above, navigate through it, while answering the questions below.
Introduction Read the first section and answer the following questions.
1. The position of each dot on the diagram tells us two things about each star: its _______________________________
(or absolute magnitude) and its _____________________________.
2. The vertical axis represents the star’s ________________________ or ____________________________ magnitude.
3. The horizontal axis represents the star’s surface _______________________________.
4. On this diagram, the higher (hotter) temperatures are on the ____________, and the lower (cooler) temperatures are on
the __________________.
5. A star in the upper left corner of the diagram would be _________________ and ___________________.
6. A star in the upper right corner of the diagram would be _________________ and ___________________.
7. The Sun rests approximately in the _________________ of the diagram, and it is the star which we use for comparison.
8. A star in the lower left corner of the diagram would be _____________ and _____________.
9. A star in the lower right corner of the diagram would be _____________ and _____________.
Interactive Lab Click on the diagram in the middle and answer the following questions.
10. Star (a) Betelgeuse: temperature is ________________________ and brightness is ________________________.
11. Star (b) Alpha Centauri B: temperature is ________________________ and brightness is _______________________.
12. Star (c) our Sun: temperature is ________________________ and brightness is ________________________.
13. Star (d) Vega: temperature is ________________________ and brightness is ________________________.
14. Star (e) Sirius B: temperature is ________________________ and brightness is ________________________.
Click the
. Skip that Interactive Lab and click the
to move to the next page: hr_interactive.html.
Interactive HR Diagrams
15. Once ___________________ _____________________ begins in a star, the star is born.
16. Stars live the majority of their lives in the _____________ _______________________________ phase, and then as
they destabilize and burn fuels other than _______________________ , they expand, reduce in core temperature, and
eventually die.
Click on the picture in the middle. Advance through a star’s life cycle.
More HR diagram Fun
Click the picture for interactive version with questions. Circle the correct letter of the answer or answers.
1. Which of the stars is oldest in terms of its life cycle? a b c d e
2. Which of the stars is (are) burning hydrogen as a fuel? a b c d e
3. Which of the stars is (are) burning helium as a fuel? a b c d e
4. Which of the stars is closest to death? a b c d e
5. Which of the stars has the highest luminosity? a b c d e
6. What causes the star with the highest luminosity to be the brightest? a b
7. Which of the stars has the lowest luminosity? a b c d e
8. The star with the lowest luminosity is dimmest because of its surface temperature or size? a b
9. Which of the stars has the highest surface temperature? a b c d e
10. Main sequence stars will become red giants when they run out of what fuel? a b c
11. Will the three main sequence stars ever become white dwarfs? a b
12. Was Star E (Sirius B) ever a main sequence star? a b
13. Predict what phase Vega will enter next: Red Giant Main Sequence Black Dwarf Variable Stage
14. Predict what phase Betelgeuse will enter next: Red Giant Main Sequence Black Dwarf Variable Stage