Front

What does the H-R diagram represent?

Back

The H-R (Hertzsprung-Russell) 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 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 Barnard's star?

Back

Barnard's star is a red dwarf star, which is cool, dim, and has a low luminosity.

Front

What characterizes a Main Sequence star?

Back

Main Sequence stars are in a stable phase of hydrogen burning in their cores, and they fall along a diagonal band on the H-R diagram.

Front

What is the spectral class of the Sun?

Back

The Sun belongs to the G spectral class.

Front

What is the significance of a star's color in the H-R diagram?

Back

A star's color indicates its temperature; cooler stars appear red, while hotter stars appear blue.

Front

What is the coldest type of star on the H-R diagram?

Back

The coldest type of star is a red star, typically found on the right side of the H-R diagram.

Front

How does luminosity relate to a star's position on the H-R diagram?

Back

Luminosity increases as you move up the H-R diagram, with the brightest stars at the top.

Front

What is the relationship between temperature and luminosity for Main Sequence stars?

Back

For Main Sequence stars, higher temperature generally corresponds to higher luminosity.

Front

What is a red dwarf star?

Back

A red dwarf star is a small and cool star on the Main Sequence, characterized by low mass and low luminosity.