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May 2006April 2004Belinda Wilkes Astronomers learn by looking
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May 2006April 2004Belinda Wilkes Life Cycle of a Star The Sun: our nearest star
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May 2006April 2004Belinda Wilkes Stars have different colors B: blue – hottest A: green – warm C: red - cool What can we measure?
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May 2006April 2004Belinda Wilkes Color, Brightness + Count them
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May 2006April 2004Belinda Wilkes What makes the Sun Shine?
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May 2006April 2004Belinda Wilkes Where are Stars Born? Clusters: Pleiades
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May 2006April 2004Belinda Wilkes Stellar Nurseries Infrared: 30 Doradus in LMC Optical
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May 2006April 2004Belinda Wilkes
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May 2006April 2004Belinda Wilkes Circumstellar Disks First image of dust disk, around 18 th brightest star 25 light years away Disk thought to be debris left from planet formation Infrared
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May 2006April 2004Belinda Wilkes
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May 2006April 2004Belinda Wilkes 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
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May 2006April 2004Belinda Wilkes HR Diagram shows age and mass
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May 2006April 2004Belinda Wilkes 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
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May 2006April 2004Belinda Wilkes
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May 2006April 2004Belinda Wilkes We are made of stardust!
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May 2006April 2004Belinda Wilkes Cassiopeia A: X-rays
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May 2006April 2004Belinda Wilkes The Crab Nebula Hubble Space T/p: OpticalChandra X-ray Observatory: X-ray
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May 2006April 2004Belinda Wilkes Chandra X-ray Observatory
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May 2006April 2004Belinda Wilkes What are X-rays?
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May 2006April 2004Belinda Wilkes Focusing X-rays
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May 2006April 2004Belinda Wilkes Launch: 23 July 1999 Space Shuttle Columbia
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May 2006April 2004Belinda Wilkes STS-93 Shuttle Crew Commander: Eileen Collins Mission Spclst: Cady Coleman Astronomer: Steve Hawley
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May 2006April 2004Belinda Wilkes Supernovae by Chandra
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