•Hertzsprung-Russell
diagram will appear over and over again in class
•Deviations from
patterns useful for understanding evolution of stars
•Equivalent kinds
of plots:
•Luminosity vs.
Temperature (what we’ve been
showing)
•Absolute
Magnitude vs. Spectral Type (the “original” H-R diagram)
•Apparent Magnitude
vs. Spectral Type
•Patterns still the
same if all stars are at same difference
•All stars will be
shifted vertically by the same amount:
m-M= -5 + 5 log(d)
•Magnitude vs.
Color (called “color-magnitude diagrams”)