17. The Hertzsprung-Russell diagram below shows how the brightness, surface temperature, and color of stars are related.
Hertzsprung-Russell Diagram
Blue
10,000 suns
Supergiants
Red
100 suns
Brightness
White
Giants
o
Main-sequence
stars
o
o
OO
0
o
1 sun
Yellow
Orange
0.01 sun
White dwarfs
оо
Red
50,000 25,000 11,000 7,800 6,300 5,300 3,800
Surface Temperature (K)
Barnard's Star
Which of these observations of Barnard's Star is most likely accurate?