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And a Star is Born xY.

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Presentation on theme: "And a Star is Born xY."— Presentation transcript:

1 And a Star is Born http://www.youtube.com/watch?v=mZL7VBmeF xY

2 May 2006April 2004Belinda Wilkes Astronomers learn by looking

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

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

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

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

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

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

9 May 2006April 2004Belinda Wilkes

10 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

11 May 2006April 2004Belinda Wilkes

12 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

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

14 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

15 May 2006April 2004Belinda Wilkes

16 http://www.powershow.com/view/1916e- MDA3M/Life_Cycle_of_a_Star_powerpoint _ppt_presentationhttp://www.powershow.com/view/1916e- MDA3M/Life_Cycle_of_a_Star_powerpoint _ppt_presentation http://www.youtube.com/watch?v=4lURsrt dNy4http://www.youtube.com/watch?v=4l URsrtdNy4http://www.youtube.com/watch?v=4l URsrtdNy4 May 2006April 2004Belinda Wilkes

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

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

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

20 May 2006April 2004Belinda Wilkes Chandra X-ray Observatory

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

22 May 2006April 2004Belinda Wilkes Focusing X-rays

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

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

25 May 2006April 2004Belinda Wilkes Supernovae by Chandra

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