Lecture 20 - Our Galaxy (4/1/99)

Prev Black Holes --- | --- Galactic Dynamics Next

ASTR012 Reading:
Chapter 18-2, 14 (ZG4)

pages 81-86

M31, the Andromeda Galaxy, a member of our Local Group. (Courtesy SEDS)
? Key Question: Why do Cepheid stars pulsate?
! Key Principle: Sound Speed
# Key Problem: Derive period-density relation for Cepheids.


  1. Cepheid Variable Stars
  2. Topology of the Galaxy
  3. Star Counts
  4. Galactic Rotation and Kinematics

Our Galaxy in Outline:

  1. Survey of Our Galaxy
  2. The Appearance of the Milky Way
  3. Distance Indicators

continued next lecture...

Prev Prev Lecture --- Next Next Lecture --- Index Astr12 Index --- Home Astr12 Home

smyers@nrao.edu Steven T. Myers