H r diagram
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Stars can be classified based on their size, temperature, and brightness. A star's temperature determines its color, with red stars being cooler and blue stars being warmer. A star's apparent brightness depends on both its true luminosity and its distance from Earth, while absolute brightness represents luminosity alone. Scientists map stars' temperatures and absolute magnitudes on a Hertzsprung–Russell diagram to study stellar evolution.
H r diagram
- 2. Stars can be classified in three ways: Size – How massive the star is Temperature – A star’s color reveals its temperature. ▪ Red stars have a cooler temperature, and blue stars have a warmer temperature. Brightness/Magnitude – The amount of light a star gives off depends on its size and temperature.
- 3. How bright a star looks from Earth depends upon both how far the star is from Earth and how bright the star actually is. A star’s brightness can be can be described in two ways: apparent magnitude and absolute magnitude.
- 4. Apparent magnitude is the brightness of a star as seen from Earth. Absolute magnitude is brightness of a star as if it were 32.6 light years from Earth. The brightness of the stars is compared to the brightness of our Sun. We call this luminosity.
- 5. An HR diagram shows the two most important characteristics of stars, which are temperature and absolute magnitude (brightness) and/or luminosity. Scientists plot the surface temperatures of stars and their brightness on a graph.
- 6. An HR diagram shows the two most important characteristics of stars, which are temperature and absolute magnitude (brightness) and/or luminosity. Scientists plot the surface temperatures of stars and their brightness on a graph.