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Unit 3: Hertzsprung-Russell Diagram Flashcards

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Unit 3: Hertzsprung-Russell Diagram Flashcards

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Questions and Answers

What is a Hertzsprung-Russell diagram?

A diagram that shows the relationship or differences between surface temperature and luminosity of stars.

What does the Y axis in the HR diagram represent?

Luminosity

What does the X axis in the HR diagram represent?

Temperature in degrees Kelvin

How is brightness shown on the Y axis?

Dim (at the bottom); to bright (at the top) Signup and view all the answers

How is temperature shown on the X axis?

From hotter (left) to cooler (right) Signup and view all the answers

In the HR diagram, what is the name of the stars shown at the very top?

Supergiants Signup and view all the answers

In the HR diagram, what is the name of the stars shown at the very bottom?

White dwarfs Signup and view all the answers

In the HR diagram, what is the name of the stars shown in the middle?

Main sequence Signup and view all the answers

In the HR diagram, what is the name of the stars shown in the middle, but to the right side?

Red giants Signup and view all the answers

Study Notes

Hertzsprung-Russell Diagram Overview

Represents the relationship between surface temperature and luminosity of stars.

Axes of the HR Diagram

Y-Axis: Indicates luminosity, with dim stars at the bottom and bright stars at the top.
X-Axis: Represents temperature, increasing from cooler stars on the right to hotter stars on the left.

Star Categories in the HR Diagram

Supergiants: Located at the very top of the diagram, indicating their high luminosity and size.
Main Sequence Stars: Found in the middle of the diagram, these stars occupy the majority of stellar types, including our Sun.
Red Giants: Positioned in the middle right, they are more luminous than main sequence stars but cooler in temperature.
White Dwarfs: Located at the very bottom of the diagram, these stars are low in luminosity despite being high in temperature.

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Description

This quiz focuses on the Hertzsprung-Russell diagram, a crucial tool in understanding the relationship between star surface temperature and luminosity. Each flashcard provides essential definitions and concepts related to the axes of the diagram. Perfect for students looking to reinforce their knowledge in stellar astrophysics.