Download HR DIAGRAM ACTIVITY

HONORS EARTH SCIENCE
HR DIAGRAM ACTIVITY
NAME _________________
DATE _______ HOUR ___
use pages 627-628 to help you
1. Of the stars plotted which is nearest to the end of its life? ________________ (name of star)
Explain how you determined this.
2. The _______________ (longer or shorter) the wavelength, the hotter the star.
3. Is luminosity more similar to absolute or apparent magnitude? (think about where the sun is) Explain.
4. If you put Spica and the Sun next to each other at equal distance, which would be brighter? Why?
For questions 5-8, choose MS, RG or WD
5. If a star is very hot and very bright, it belongs in this category ___________________
6. If a star is very cool and very dim, it belongs in this category ___________________
7. If a star is very hot and very dim it belongs in this category ______________________
8. If a star is very cool and very bright, it belongs in this category __________________
9. Which star is the brightest white dwarf on the H-R diagram?
10. Which star is the hottest supergiant on the H-R diagram?
11. What color are the coolest stars?
12. If you know a star’s color, you can determine its _________________
13. (circle one) HOT or COLD stars have a shorter life span.
14. In the MAIN SEQUENCE, what color are the most massive stars? __________
In the MAIN SEQUENCE, what color are the least massive stars? __________
15. You have discovered a new star! You know it’s temperature and luminosity (brightness). List 2 other
pieces of information you can tell about your star once you plot it on the HR diagram
16. Which type of star should be considered when looking for stars that might have life supporting planets
around them? Explain why.
17. On the HR diagram to the left, fill in the boxes with the
following terms: hot bright, cool bright, hot dim, cool dim
BONUS: WHY ARE THERE NO GREEN STARS?
Use your own words and site your source.