HR diagrams (all)

Front

What is an 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 luminosity mean in the context of stars?

Back

Luminosity is the total amount of energy emitted by a star per unit of time, often compared to the Sun's luminosity.

Front

What are main-sequence stars?

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.

Front

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

Back

A star's surface temperature determines its color and spectral class, influencing its luminosity and life cycle.

Front

What are red dwarfs?

Back

Red dwarfs are small, cool stars on the main sequence, with low luminosity and temperature.

Front

What is a supergiant star?

Back

Supergiant stars are among the largest stars in the universe, with high luminosity and large radii, often in the later stages of stellar evolution.

Front

What is the spectral classification of stars?

Back

Spectral classification categorizes stars based on their temperature and the characteristics of their spectra, using letters O, B, A, F, G, K, and M.

Front

What does it mean if a star is classified as 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.

Front

What is the relationship between temperature and color in stars?

Back

The temperature of a star affects its color; hotter stars appear blue or white, while cooler stars appear red.

Front

What is the hottest type of star?

Back

The hottest type of star is classified as a type O star, with surface temperatures exceeding 30,000 K.