1. Environmental Science
H-R Diagrams
Environmental Science

2. H-R Diagram Hertzsprung-Russell diagram
a plot of star’s temperature vs. luminosity (brightness)
Maps the life cycle of stars
Star’s location on diagram can indicate both its mass and its relative age

3. Label your H-R diagram as we move through the next few slides.

4. Luminosity / Brightness
increasing
Temperature
increasing

5. Supergiants
Luminosity
Giants
Main Sequence
White Dwarfs
Temperature

6. Cool & Bright
Hot & Bright
The Sun
Cool & Dim
Hot & dim

7. Main Sequence Stars
A major grouping of stars that forms a narrow band from the upper left to the lower right
Includes more than 90 % of stars
The Sun is a main sequence star

8. H-R Diagram Resources https://www.youtube.com/watch?v=588oz17Xj8o