HR Diagram

Front

What is the HR Diagram?

Back

The HR Diagram (Hertzsprung-Russell Diagram) is a scatter plot that shows the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

Front

What does the spectral class of a star indicate?

Back

The spectral class of a star indicates its temperature and color, which are determined by the star's surface temperature.

Front

Which spectral class does our sun belong to?

Back

G

Front

What color are the hottest stars?

Back

Blue stars are the hottest.

Front

What color are the coolest stars?

Back

Red stars are the coolest.

Front

What type of stars are found in area A of the HR Diagram?

Back

Bright and hot stars are found in area A.

Front

What is the relationship between a star's brightness and its temperature?

Back

Generally, hotter stars are brighter than cooler stars.

Front

What can be inferred about Barnard's Star based on its position in the HR Diagram?

Back

Barnard's Star is less bright than the sun and cooler.

Front

What is the significance of the main sequence in the HR Diagram?

Back

The main sequence is where most stars, including the sun, are found, and it represents a stable phase of stellar evolution.

Front

What happens to stars after they leave the main sequence?

Back

After leaving the main sequence, stars can become red giants or supergiants, depending on their mass.