May 2006April 2004Belinda Wilkes Astronomers learn by looking.

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Presentation transcript:

May 2006April 2004Belinda Wilkes Astronomers learn by looking

May 2006April 2004Belinda Wilkes Life Cycle of a Star The Sun: our nearest star

May 2006April 2004Belinda Wilkes Stars have different colors B: blue – hottest A: green – warm C: red - cool What can we measure?

May 2006April 2004Belinda Wilkes Color, Brightness + Count them

May 2006April 2004Belinda Wilkes What makes the Sun Shine?

May 2006April 2004Belinda Wilkes Where are Stars Born? Clusters: Pleiades

May 2006April 2004Belinda Wilkes Stellar Nurseries Infrared: 30 Doradus in LMC Optical

May 2006April 2004Belinda Wilkes

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

May 2006April 2004Belinda Wilkes

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

May 2006April 2004Belinda Wilkes HR Diagram shows age and mass

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

May 2006April 2004Belinda Wilkes

May 2006April 2004Belinda Wilkes We are made of stardust!

May 2006April 2004Belinda Wilkes Cassiopeia A: X-rays

May 2006April 2004Belinda Wilkes The Crab Nebula Hubble Space T/p: OpticalChandra X-ray Observatory: X-ray

May 2006April 2004Belinda Wilkes Chandra X-ray Observatory

May 2006April 2004Belinda Wilkes What are X-rays?

May 2006April 2004Belinda Wilkes Focusing X-rays

May 2006April 2004Belinda Wilkes Launch: 23 July 1999 Space Shuttle Columbia

May 2006April 2004Belinda Wilkes STS-93 Shuttle Crew Commander: Eileen Collins Mission Spclst: Cady Coleman Astronomer: Steve Hawley

May 2006April 2004Belinda Wilkes Supernovae by Chandra