Chapter 9 THE FAMILY OF STARS
        (2 lectures)

        Section 9-1 Measuring the Distance to Stars
        - Read pp 174-177 (stop at "Proper Motion")
        - Study Figures 9-1, 9-2, 9-3 

        Section 9-2 Intrinsic Brightness ( = Luminosity)
        - Read p 178 (stop at "Absolute Visual Magnitude")
        - Study Figure: 9-5
        - Read p 179 second column - read first paragraph under heading "Luminosity"
        - Read p 180 first column  - read the paragraph starting with "The symbol L_0..."

        Section 9-3 The Diameters of Stars
        - Read pp 180-181 (stop at "The H-R Diagram")
        - Study Figure: 9-6  (seems silly, but important point)
 
        Section 9-4 The Masses of Stars
        - Read pp 187-188 (stop at "Visual Binary Systems")
        - Study Figures: 9-14, 9-15, 9-16, 9-17, 9-18

        Know:
        The Inverse Square Law of Light (best from Lecture PPT slides)

        Summary 
        Sec 9-1: bullets 1-3
        Sec 9-4: bullet  1


        New Terms: 
        - stellar parallax
        - parsec
        - luminosity
        - binary stars