Astro 1050     Mon., Nov. 4, 2002

Chapter 12   The Milky Way Galaxy

The Milky Way (during the Leonid Meteor Shower)

Where are we within the plane?

To sort out location will need:

Distances to the farther stars

Example of a Variable

The Instability Strip

The Period-Luminosity Relationship

Calibrating the Period-Luminosity Relationship using Proper Motion

Globular vs. open clusters

The Distribution of Globular Clusters

The Shapley-Curtis Debate:  1920

The Andromeda Galaxy

M51:  The Whirlpool Galaxy

Sensing Hydrogen Gas

The Structure of our Galaxy

Disk vs. Halo Orbits

Differential Galactic Rotation

The Galactic Rotation Curve

Stellar Population and Galaxy Evolution

Traditional Model of Galaxy Evolution

M51:  The Whirlpool Galaxy

Possible Origin of Spiral Arms

Degree of Organization
 of the Spiral Arms

Degree of Organization
 of the Spiral Arms

Tracing the Spiral Arms

M51:  The Whirlpool Galaxy

Density Wave Theory

M51:  The Whirlpool Galaxy

Self Sustaining Star Formation

Two limiting cases of spirals

The Nucleus of the Galaxy

A movie of stars at the core