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 position of a star on the HR Diagram indicate?

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The position of a star on the HR Diagram indicates its temperature, luminosity, and evolutionary stage.

Front

Where are the hottest stars located on the HR Diagram?

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The hottest stars are located on the left side of the HR Diagram.

Front

Where are the coolest stars located on the HR Diagram?

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The coolest stars are located on the right side of the HR Diagram.

Front

What is luminosity in the context of stars?

Back

Luminosity is the total amount of energy emitted by a star per unit of time, often measured in watts.

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How does the brightness of a star relate to its distance from Earth?

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A star's brightness as seen from Earth (apparent brightness) decreases with distance; a star can be very luminous but appear dim if it is far away.

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What type of star is Rigel?

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Rigel is a blue supergiant star, known for its high luminosity and temperature.

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What is a brown dwarf?

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A brown dwarf is a substellar object that is not massive enough to sustain hydrogen fusion in its core, often having a temperature below 1000K.

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

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A star's surface temperature determines its color, spectral type, and position on the HR Diagram.

Front

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

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A star's color is an indicator of its temperature; hotter stars appear blue or white, while cooler stars appear red.