Review - Life of a Star and HR Diagram

Front

What is luminosity?

Back

Luminosity is the measure of brightness or intensity of light that does not depend on the distance from the viewer.

Front

What happens to a star larger than the Sun when it is no longer a main sequence star?

Back

It becomes a super giant.

Front

Order the stages in the life of a low-mass star like the Sun: A) Red giant; B) White dwarf; C) Main sequence star.

Back

C / A / B

Front

What type of star has a temperature of 2,000 K and a luminosity less than the Sun?

Back

Red dwarf.

Front

What does the color of a star depend on?

Back

The color of a star depends on its temperature.

Front

What is the HR Diagram?

Back

The HR Diagram (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 categories of stars on the HR Diagram?

Back

The main categories are main sequence stars, giants, supergiants, and white dwarfs.

Front

What is a main sequence star?

Back

A main sequence star is a star that is in the stable phase of its life cycle, where it fuses hydrogen into helium in its core.

Tags

NGSS.HS-ESS1-1

Front

What is a red giant?

Back

A red giant is a late stage in the life of a star where it has expanded and cooled after exhausting the hydrogen in its core.

Tags

NGSS.HS-ESS1-3

Front

What is a white dwarf?

Back

A white dwarf is the remnant core of a low-mass star that has shed its outer layers and is no longer undergoing fusion.