HR Diagram Practice

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 is a Main Sequence Star?

Back

Main Sequence Stars are stars that are in the stable phase of their life cycle, where they fuse hydrogen into helium in their cores. The Sun is an example of a Main Sequence Star.

Front

Which Main Sequence Star is slightly more luminous than our Sun?

Back

Alpha Centauri.

Front

What is a Red Giant?

Back

A Red Giant is a late stage in the life cycle of a star, characterized by a large radius and high luminosity, but a relatively low surface temperature.

Front

Which star is the coolest on the HR diagram?

Back

Mira.

Front

What is a White Dwarf?

Back

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

Front

Which spectral class of stars has some of the hottest stars?

Back

Main Sequence.

Front

What is the significance of luminosity in the HR Diagram?

Back

Luminosity indicates the total amount of energy emitted by a star per second, which helps classify stars and understand their life cycles.

Front

Which star has a luminosity of about 10,000 and a temperature of about 4,000°C?

Back

Betelgeuse.

Front

What is a Supergiant?

Back

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