Chapters 10 and 11 The Sun & the Characterizing Stars

1. Chapters 10 and 11The Sun & the Characterizing Stars

2. “We are star stuff” - Carl Sagan

3. Kelvin Temperature Scale Kelvin Temperature = _______ Temperature + _____

4. The Sun and other stars are huge and massive!!!

5. Sunspots • regions of the solar surface that • is dark and relatively cool • appear dark because they give • off less radiation per unit area • than the photosphere that • surrounds them • can use sunspots to determine • the Sun’s period of rotation

6. Sunspot Cycle Minimum number Maximum number

7. Babcock’s Magnetic Dynamo Theory

8. Solar magnetic fields also create other atmospheric phenomena

9. Binary Stars ___________: multiple systems bound by gravity and orbiting each other around their center of mass (___________)

10. Contact Binary Stars

11. Star Clusters

12. Star Clusters ________________ _____________ • closely packed toward • toward the center • shaped like a ball • all are old stars • 10,000-1,000,000 stars • located in the galactic • halo • loose grouping of stars • irregular shape • composed predominantly of young stars • hundreds of stars • located in the plane of the Milky Way

13. Open or Globular Cluster?

15. The orbital motion of binary stars affects the ___________ of their spectral lines

16. Some binary stars ________ each other

17. Colors and Temperatures A star’s color reveals its surface ____________

18. The Spectral Type of Stars • stars are classified by their spectral types: • _____________ to ___________ • ______________ to ____________ • An important sequence to remember: • Oh Be a Fine Guy (or Girl), Kiss Me

19. Stars are classified by their spectra as O, B, A, F,G, K, and M spectral types