A bit about me! Dr. Belinda Wilkes, Professional Astrophysicist (Astronomer) Smithsonian Astrophysical Observatory, Cambridge, Mass., USA On contract to.

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Presentation transcript:

A bit about me! Dr. Belinda Wilkes, Professional Astrophysicist (Astronomer) Smithsonian Astrophysical Observatory, Cambridge, Mass., USA On contract to NASA to run Chandra X-ray Observatory (Hubble’s X-ray sister) English, BSc St. Andrews, PhD Cambridge In USA since 1982 May 2006April 2004 Belinda Wilkes

Astronomers learn by looking May 2006April 2004 Belinda Wilkes

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

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

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

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

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

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

Circumstellar Disks Infrared First image of dust disk, around 18th brightest star 25 light years away Disk thought to be debris left from planet formation May 2006April 2004 Belinda Wilkes

May 2006April 2004 Belinda 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 2004 Belinda Wilkes

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

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

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

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

Chandra X-ray Observatory May 2006April 2004 Belinda Wilkes

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

Focusing X-rays May 2006April 2004 Belinda Wilkes

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

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

Supernovae by Chandra May 2006April 2004 Belinda Wilkes

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