HR Diagram Practice

Front

What is the HR Diagram?

Back

The HR Diagram (Hertzsprung-Russell Diagram) is a scatter plot that shows the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

Front

What does luminosity refer to in 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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What is a Main Sequence Star?

Back

A Main Sequence Star is a star that is in the main phase of its life cycle, where it fuses hydrogen into helium in its core. The Sun is an example.

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What is a White Dwarf?

Back

A White Dwarf is a small, dense star that is the remnant of a star that has exhausted its nuclear fuel and shed its outer layers.

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What are Supergiants?

Back

Supergiants are among the largest stars in the universe, with high luminosity and size, often found at the top of the HR Diagram.

Front

What is the temperature range of Main Sequence Stars?

Back

Main Sequence Stars have a temperature range from about 2,500°C to over 40,000°C.

Front

Which star is known for being the brightest in the night sky?

Back

Sirius is known as the brightest star in the night sky.

Front

What is the significance of the spectral class of a star?

Back

The spectral class of a star indicates its temperature, color, and the presence of certain elements in its atmosphere.

Front

What is the average luminosity of the Sun?

Back

The average luminosity of the Sun is defined as 1 solar luminosity (L☉), which is the standard for measuring other stars' luminosities.

Front

What is the relationship between temperature and luminosity in stars?

Back

Generally, hotter stars are more luminous than cooler stars, which is a key principle in the HR Diagram.