The Hertzsprung-Russell Diagram

Answer the questions using the above HR Diagram

1. What factor affects the color of a star?

2. What is luminosity?

3. What factor affects the luminosity of a star?

4. What is the approximate surface temperature of the sun?

5. What is the color of the stars with the highest surface temperature?

6. What type of star has a high temperature but a low luminosity?

7. Most of the stars on the HR Diagram are classified as which type of star?

8. How is it possible for white dwarfs to have a lower luminosity than the sun even though the sun is cooler than white dwarfs?

9. What is the color of the stars with the lowest surface temperature?
10. What type of star has a low temperature but a high luminosity?

2. Luminosity is an absolute measure of radiated electromagnetic power, the radiant power emitted by a light-emitting object. In astronomy, luminosity is the total amount of electromagnetic energy emitted per unit of time by a star, galaxy, or other astronomical object.

3. Luminosity depends on temperature and size

4. 6000 Kelvin

5. blue, white, yellow, orange, red

6. white dwarfs

7. main sequence

8. Since the white dwarf is smaller, it can have a lower luminosity

9. Red

10. Red Giants

ahsan57900 ahsan57900 · Answer 2 · 2022-04-05T13:04:20+02:00

Temperature of star determined colour of a star.

What factor affects the color of a star?

The surface temperature of a star determines the color of light it emits. Blue stars are hotter as compared to other stars such as yellow and red stars.

What is luminosity?

Luminous is the quality of light or relative brightness of something and this term is known as luminosity.

What factor affects the luminosity of a star?

Size and temperature of the star determine the luminosity of a star. As the size of a star increases, luminosity increases. Increased temperature also increase luminosity of a star.

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