Questions and Answers
What factor affects the color of a star?
Surface temperature of the star
What factor affects the luminosity of a star?
Size and brightness
What is the approximate surface temperature of the sun?
5,500 kelvin
Is the surface temperature of white-dwarf stars higher or lower than red super giants?
Signup and view all the answers
What is the color of the highest surface temperature?
Signup and view all the answers
What is the color of the lowest surface temperature?
Signup and view all the answers
List the color of stars from hottest to coldest.
Signup and view all the answers
Most of the stars on the HR diagram are classified as what type of star?
Signup and view all the answers
What type of star has a high temperature, but a low luminosity?
Signup and view all the answers
What type of star has a high temperature and a high luminosity?
Signup and view all the answers
What type of star has a low temperature and the highest luminosity?
Signup and view all the answers
What type of star has a low temperature and a low luminosity?
Signup and view all the answers
The HR diagram uses two categories to organize stars. What are the two categories?
Signup and view all the answers
What does the X-axis of the HR diagram measure?
Signup and view all the answers
What does the Y-axis of the HR diagram measure?
Signup and view all the answers
What is the name given to a different way to measure luminosity?
Signup and view all the answers
Which letter are the Red super giants?
Signup and view all the answers
Which type of stars are located in letter B?
Signup and view all the answers
Which type of stars are located in letter C?
Signup and view all the answers
Which letter belongs to white dwarfs?
Signup and view all the answers
Study Notes
Surface Temperature of Stars
- A star's color is influenced by its surface temperature.
- The sun has an approximate surface temperature of 5,500 kelvin.
- White-dwarf stars possess a higher surface temperature compared to red super giants.
Luminosity of Stars
- A star's luminosity is affected by its size and brightness.
- Blue giants exhibit both high temperature and high luminosity.
- Red super giants have low temperature but the highest luminosity among stars.
Star Color Spectrum
- The color spectrum of stars from hottest to coldest is: blue, light-blue, white, white-yellow, yellow, orange, red.
- Blue represents the color with the highest surface temperature, while red represents the lowest.
HR Diagram Classification
- The majority of stars on the HR diagram are classified as main sequence stars.
- Main sequence stars have low temperature and low luminosity, represented as red.
Star Types and Characteristics
- White dwarfs have high temperatures but low luminosity.
- Red super giants are characterized by low temperature and the highest luminosity.
- Red giants are classified under letter C on the HR diagram.
HR Diagram Axes
- The X-axis of the HR diagram measures the temperature of the stars.
- The Y-axis measures the luminosity of the stars.
- Luminosity can also be represented using absolute magnitude, a different measurement unit for luminosity.
HR Diagram Labels
- Red super giants are represented by letter A on the HR diagram.
- Main sequence stars are located at letter B, while white dwarfs are designated under letter D.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of the HR diagram with these flashcards! Each card presents a key concept related to the surface temperature, size, brightness, and luminosity of stars. Perfect for students of astronomy looking to reinforce their understanding of stellar characteristics.
