Question

written portion (+2): using the hertzsprung - russell diagram (h - r diagram), determine if the following statements made by each student is correct:
a. amanda: \all of the main sequence stars have high absolute brightness.\
b. brad: \barnard’s star and mira are similar in they both are the color red, but are different in absolute brightness.\
c. carl: \deneb is an extremely bright star, white in color, with a surface temperature of about 10,000 degrees fahrenheit.\
d. darlene: \betelgeuse is a giant, and therefore is much larger and more massive than barnard’s star, a small main - sequence star. barnard’s star will last much less than betelgeuse, since its mass is much less.\

Explanation:

a. False. Main - sequence stars have a range of absolute brightnesses.
b. True. Barnard's star and Mira can be compared on H - R diagram for color and absolute brightness.
c. True. Deneb's characteristics can be verified on H - R diagram.
d. False. Smaller main - sequence stars like Barnard's star last much longer than giants like Betelgeuse due to slower fuel consumption.

Answer:

a. False
b. True
c. True
d. False