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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.

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a bit about me
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

BelindaWilkes

life cycle of a star
Life Cycle of a Star

The Sun:

our nearest star

BelindaWilkes

stars have different colors
Stars have different colors
  • B: blue – hottest
  • A: green – warm
  • C: red - cool

What can we measure?

BelindaWilkes

stellar nurseries
Stellar Nurseries

Optical

Infrared: 30 Doradus in LMC

BelindaWilkes

circumstellar disks
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

BelindaWilkes

stellar life
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

BelindaWilkes

death of a star
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

BelindaWilkes

the crab nebula
The Crab Nebula

Chandra X-ray Observatory: X-ray

Hubble Space T/p: Optical

BelindaWilkes

what are x rays
What are X-rays?

BelindaWilkes

focusing x rays
Focusing X-rays

BelindaWilkes

sts 93 shuttle crew
STS-93 Shuttle Crew

Commander:

Eileen Collins

Mission Spclst:

Cady Coleman

Astronomer:

Steve Hawley

BelindaWilkes