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?
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What is the color of the highest surface temperature?
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What is the color of the lowest surface temperature?
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List the color of stars from hottest to coldest.
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Most of the stars on the HR diagram are classified as what type of star?
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What type of star has a high temperature, but a low luminosity?
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What type of star has a high temperature and a high luminosity?
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What type of star has a low temperature and the highest luminosity?
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What type of star has a low temperature and a low luminosity?
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The HR diagram uses two categories to organize stars. What are the two categories?
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What does the X-axis of the HR diagram measure?
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What does the Y-axis of the HR diagram measure?
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What is the name given to a different way to measure luminosity?
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Which letter are the Red super giants?
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Which type of stars are located in letter B?
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Which type of stars are located in letter C?
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Which letter belongs to white dwarfs?
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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.
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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.