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Astronomy Notes

by: Hannah Moore

Astronomy Notes ASTR-1020-90

Hannah Moore
Clayton State

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About this Document

Chapter 19 Our galaxy
Stellar and Galactic Astronomy
Dr. Campbell
Class Notes
astronomy, Galaxy, black holes
25 ?




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This 2 page Class Notes was uploaded by Hannah Moore on Thursday March 17, 2016. The Class Notes belongs to ASTR-1020-90 at Clayton State University taught by Dr. Campbell in Winter 2016. Since its upload, it has received 19 views. For similar materials see Stellar and Galactic Astronomy in Science at Clayton State University.


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Date Created: 03/17/16
Chapter 19: Our Galaxy  The Milky Way Revealed o What does our galaxy look like?  Dusty and gas obscure our view of the galaxy.  Looks like a disk  100,000 light-years in diameter  Bulge in the middle  Globular Clusters in the halo o Halo is outside the disk  Has spiral arms: different color from bulge o Blueish: bigger, younger stars  Barred Spiral  The bulge is elongated like a bar is in it. o How do stars orbit in our galaxy?  Stars in the disk travel in circles with little up and down motions  Halo stars go above the disk randomly  Bulge stars move in random paths  We have a 230 million-year orbit  Orbital Velocity Law  The orbital speed and radius of an object on a circular orbit around the galaxy tells us the mass within that orbit.  Galactic Recycling o How is gas recycled in our galaxy?  Star-Gas-Star Cycle n o Wh er dIonization nebulae are found around short-lived high-mass stars  Shows star activity  None in halo, or bugle o No stars being formed  Reflection nebulae scatters the light from stars  Spiral Arms of the galaxy is where most of the star formation takes place  History of the Milky Way o What clues to our galaxy’s history do halo stars hold?  Halo Stars are older than our galaxy  Formed first then stopped o Giant cloud makes the halo stars are it contracts.  Center of our galaxy o What lies in the center of our galaxy?  Lots of stars orbit around it  We believe it is a black hole  Lots of mass  Invisible  Small Region  See X-ray bursts, but no accretion disk l


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