Lecture 6

 

The Milky Way

 

 

 

  1. Variable stars as a distance yardstick

 

 

 

 

 

a.       RR Lyrae stars

 

 

 

 

 

b.      Cepheid variables and period-luminosity relationship

 

 

 

 

 

  1. The Milky Way and its structure

 

 

 

 

 

a.       21-cm radiation

 

 

 

 

 

b.      Disk

 

 

 

 

 

c.       Bulge

 

 

 

 

 

d.      Halo

 

 

 

 

 

e.       Nucleus

 

 

 

 

 

f.        Spiral arms

 

 

 

 

 

g.       Rotation curve and mass of the Milky Way