HR Diagram Flashcard

Front

What is the HR Diagram?

Back

The Hertzsprung-Russell Diagram (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 Main Sequence represent on the HR Diagram?

Back

The Main Sequence is a continuous and distinctive band of stars that appears on the HR Diagram, where about 90% of stars, including our Sun, are found. These stars are in a stable phase of hydrogen burning.

Front

Which stars are found in the top-left corner of the HR Diagram?

Back

The top-left corner of the HR Diagram is occupied by hot, luminous stars, often referred to as blue giants.

Front

What type of stars are located in the bottom-right corner of the HR Diagram?

Back

The bottom-right corner of the HR Diagram is where cool, dim stars, such as red dwarfs and brown dwarfs, are located.

Front

What is the significance of a star's surface temperature on the HR Diagram?

Back

A star's surface temperature determines its position on the HR Diagram, with hotter stars located on the left and cooler stars on the right.

Front

What is a brown dwarf?

Back

A brown dwarf is a substellar object that is too massive to be a planet but not massive enough to sustain hydrogen fusion like a star.

Front

Where are the brightest stars located on the HR Diagram?

Back

The brightest stars are typically found in the upper part of the HR Diagram, particularly in the supergiant region.

Front

What is the relationship between a star's luminosity and its position on the HR Diagram?

Back

A star's luminosity increases as you move up the HR Diagram, with the most luminous stars at the top.

Front

What does the term 'supergiant' refer to in the context of the HR Diagram?

Back

Supergiants are very large and luminous stars that are found in the upper regions of the HR Diagram, often having a short lifespan.

Front

What is the typical life cycle stage of most stars?

Back

Most stars spend the majority of their life cycle in the Main Sequence stage.