© 2011 Pearson Education, Inc. Chapter 17 Measuring the Stars.
Chapters 12 and 13 The Sun & Measuring the Properties of Stars.
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Transcript of Chapters 12 and 13 The Sun & Measuring the Properties of Stars.
Chapters 12 and 13The Sun & Measuring the Properties of
Stars
“We are star stuff”
- Carl Sagan
Reminder...
• star: A self-luminous, gravitationally bound, ball of gas that shines or has shone because of nuclear reaction in its interior
Brown Dwarfs- Failed Stars
• Mass < 8% the mass of the Sun
• And 10-80 times the mass of Jupiter
• First detected in 1995
The Sun and other stars are huge and massive!!!
Figure 11.1
Our Sun
Sunspots• regions of the photosphere that are dark and relatively cool
• corresponds to regions of intense magnetic fields
• Galileo monitored their movement to determine the rotation period of the Sun=about 1 month
Figure 11.16
Sunspots occur when the magnetic field loops outof the photosphere
Figure 11.18a
Prominences
Filaments
Flares and Coronal Mass Ejections
coronal mass ejections
flares
The Earth’s magnetic field protects us!
Sunspot Cycle
Maximum number
Minimum number
Figure 11.23
Sun’s Rotation
Babcock’s Magnetic Dynamo Theory
Binary Stars
binary stars: multiple systems bound by gravity and orbiting each other around their center of mass (double star)
Contact Binary Stars
Star Clusters
Open Cluster Globular Cluster
Open or Globular Cluster?