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.
![Page 1: Chapters 12 and 13 The Sun & Measuring the Properties of Stars.](https://reader036.fdocuments.net/reader036/viewer/2022062317/5a4d1b3c7f8b9ab05999ee83/html5/thumbnails/1.jpg)
Chapters 12 and 13The Sun & Measuring the Properties of
Stars
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“We are star stuff”
- Carl Sagan
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Reminder...
• star: A self-luminous, gravitationally bound, ball of gas that shines or has shone because of nuclear reaction in its interior
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Brown Dwarfs- Failed Stars
• Mass < 8% the mass of the Sun
• And 10-80 times the mass of Jupiter
• First detected in 1995
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The Sun and other stars are huge and massive!!!
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Figure 11.1
Our Sun
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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
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Figure 11.16
Sunspots occur when the magnetic field loops outof the photosphere
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Figure 11.18a
Prominences
Filaments
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Flares and Coronal Mass Ejections
coronal mass ejections
flares
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The Earth’s magnetic field protects us!
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Sunspot Cycle
Maximum number
Minimum number
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Figure 11.23
Sun’s Rotation
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Babcock’s Magnetic Dynamo Theory
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Binary Stars
binary stars: multiple systems bound by gravity and orbiting each other around their center of mass (double star)
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Contact Binary Stars
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Star Clusters
Open Cluster Globular Cluster
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Open or Globular Cluster?