HR Diagram

Front

What is the HR Diagram?

Back

The Hertzsprung-Russell (HR) 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 the X-axis of the HR Diagram represent?

Back

The X-axis of the HR Diagram represents the surface temperature of stars, typically measured in Kelvin, with hotter stars on the left and cooler stars on the right.

Front

What does the Y-axis of the HR Diagram represent?

Back

The Y-axis of the HR Diagram represents the luminosity of stars, often expressed in terms of the Sun's luminosity.

Front

What color are the hottest stars on the HR Diagram?

Back

The hottest stars on the HR Diagram are blue.

Front

What color are the coolest stars on the HR Diagram?

Back

The coolest stars on the HR Diagram are red.

Front

What type of stars are found in the Main Sequence?

Back

The Main Sequence contains stars that are fusing hydrogen into helium in their cores, including both low mass and high mass stars.

Front

Where are White Dwarfs located on the HR Diagram?

Back

White Dwarfs are located in the lower left corner of the HR Diagram, indicating they are hot but have low luminosity.

Front

What are Red Supergiants?

Back

Red Supergiants are very large stars that are cooler in temperature and are located in the upper right of the HR Diagram.

Front

What is the significance of the Main Sequence on the HR Diagram?

Back

The Main Sequence is significant because it represents the majority of stars in the universe, where they spend most of their lifetimes.

Front

How does a star's position on the HR Diagram relate to its life cycle?

Back

A star's position on the HR Diagram indicates its stage in the stellar life cycle, from formation to main sequence to eventual death as a supernova or white dwarf.