H-R Diagram

Front

What is the H-R Diagram?

Back

The Hertzsprung-Russell Diagram (H-R Diagram) is a scatter plot of stars showing the relationship between their absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

Front

What does 'Luminosity' mean?

Back

Luminosity refers to the absolute brightness of a star, which is the total amount of energy emitted by the star per unit time.

Front

Which type of star is the hottest?

Back

O-type stars are the hottest stars on the H-R Diagram.

Front

What is the Main Sequence in the H-R Diagram?

Back

The Main Sequence is a continuous and distinctive band of stars that appears on the H-R Diagram, where stars spend most of their lives fusing hydrogen into helium.

Front

What do all stars on the Main Sequence have in common?

Back

All stars on the Main Sequence undergo hydrogen fusion in their cores.

Front

Where are White Dwarfs located on the H-R Diagram?

Back

White Dwarfs are located below the Main Sequence on the H-R Diagram.

Front

What is the relationship between temperature and color in stars?

Back

The temperature of a star determines its color; hotter stars appear blue or white, while cooler stars appear red or orange.

Front

What is 'apparent brightness'?

Back

Apparent brightness is the brightness of a star as seen from Earth, which can be affected by distance and interstellar material.

Front

What is the significance of the H-R Diagram for astronomers?

Back

The H-R Diagram helps astronomers classify stars and understand their life cycles, including their stages of evolution.

Front

What are Red Giants?

Back

Red Giants are large, luminous stars that have expanded and cooled, located above the Main Sequence on the H-R Diagram.