HR Diagram

Front

What is the Hertzsprung-Russell (HR) diagram?

Back

The 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 represents the temperature of stars, which decreases from left to right.

Front

What does the y-axis of the HR diagram represent?

Back

The y-axis represents the luminosity of stars, often measured in terms of the Sun's luminosity.

Front

What is the Main Sequence on the HR diagram?

Back

The Main Sequence is a continuous and distinctive band of stars that appears on the HR diagram, where stars spend most of their life cycle fusing hydrogen into helium.

Tags

NGSS.HS-ESS1-3

Front

Which type of stars are found on the right side of the HR diagram?

Back

Cooler stars, including red giants and supergiants, are found on the right side of the HR diagram.

Front

Which type of stars are found on the left side of the HR diagram?

Back

Hotter stars, including blue giants and white dwarfs, are found on the left side of the HR diagram.

Front

What is a yellow main sequence star?

Back

A yellow main sequence star is a star that has a surface temperature between approximately 5,300 to 6,000 Kelvin, like the Sun.

Tags

NGSS.HS-ESS1-1

Front

What is the significance of the temperature scale on the HR diagram?

Back

The temperature scale helps classify stars and understand their life cycles, as temperature affects a star's color, brightness, and evolutionary stage.

Front

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

Back

Generally, hotter stars appear blue or white, while cooler stars appear red or orange.

Front

What is the difference between luminosity and brightness?

Back

Luminosity is the total amount of energy emitted by a star per second, while brightness is how bright a star appears from Earth, which can be affected by distance.