1. Astronomers learn by looking
May 2006April 2004
Belinda Wilkes

2. Life Cycle of a Star The Sun: our nearest star May 2006April 2004
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3. Stars have different colors
B: blue – hottest
A: green – warm
C: red - cool
What can we measure?
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Belinda Wilkes

4. Color, Brightness + Count them
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5. What makes the Sun Shine?
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6. Where are Stars Born? Clusters: Pleiades
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7. Stellar Nurseries Optical Infrared: 30 Doradus in LMC
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8. The Crab Nebula Chandra X-ray Observatory: X-ray
Hubble Space T/p: Optical
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9. May 2006April 2004
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10. Stellar Life Star burns fuel in its core (fusion: H→Helium)
Initially fuel is H, star is on Main Sequence “Adult” (e.g. The Sun)
When H runs out, core heats up and He, burns: “Middle Age” (Giant star)
then He runs out, it burns heavier elements, e.g. Fe
May 2006April 2004
Belinda Wilkes

11. HR Diagram shows age and mass
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12. Death of a Star When all fuel runs out, the core collapses
Outer regions of star explode outwards: Supernova
SN shine more brightly than a galaxy for a few hours/days
May 2006April 2004
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13. We are made of stardust!
May 2006April 2004
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14. Cassiopeia A: X-rays
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15. What are X-rays?
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16. Supernovae by Chandra
May 2006April 2004
Belinda Wilkes