HR Diagram

Front

What is the H-R Diagram used for?

Back

The H-R Diagram (Hertzsprung-Russell Diagram) is used to classify stars based on their luminosity, temperature, and evolutionary stage.

Front

What are the main regions of the H-R Diagram?

Back

The main regions of the H-R Diagram include the Main Sequence, Red Giants, Supergiants, and White Dwarfs.

Front

What type of star is found on the Main Sequence?

Back

Main Sequence stars are those that are in the stable phase of hydrogen burning in their cores, such as our Sun.

Front

What characteristics define a spiral galaxy?

Back

Spiral galaxies are characterized by their flat, rotating disks containing stars, gas, and dust, along with a central concentration of stars known as the bulge.

Front

What is a key feature of irregular galaxies?

Back

Irregular galaxies lack a distinct shape or structure and often have a chaotic appearance with no clear bulge or spiral arms.

Front

What does it mean for a star to be 'hot, faint, and blue'?

Back

A star that is 'hot, faint, and blue' typically has a high surface temperature, low luminosity, and emits more blue light, indicating it is a more evolved star.

Front

What is the significance of Sirius B in the H-R Diagram?

Back

Sirius B is a white dwarf star that is hot and faint, representing a stage in stellar evolution where a star has exhausted its nuclear fuel.

Front

How do you identify a Main Sequence star on the H-R Diagram?

Back

Main Sequence stars are located along the diagonal band from the upper left (hot, luminous stars) to the lower right (cool, dim stars) of the H-R Diagram.

Front

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

Back

A star's temperature is directly related to its color; hotter stars appear blue or white, while cooler stars appear red or orange.

Front

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.