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The reason is due to the different production mechanism for the energy output from the star and the increased size of the Red Giant.
As a star moves into its Red Giant phase, after not being able to maintain gravitational equilibrium due to hydrogen begin exhausted in the core, the star begins to collapse. This collapse heats a hydrogen shell just outside the core (previously not available for fusion) initiating fusion of hydrogen to helium in the shell. This means fusion is taking place closer to the surface of the star and leads to increased reaction rates then before. This produces enough energy to increase the star's luminosity by a factor of 1,000--10,000. The temperature of the star goes down because the star balloons out with this increased reaction rate, meaning the energy is distributed over a larger area. Hence, you get a bright, cooler star.
What else can I help you with?
Which types of star has low temperature and high luminosity?
A red giant star.
Where are cool red giant stars on the H-R?
Cool red giant stars are located in the upper right corner of the Hertzsprung-Russell diagram, where they are both cool (low temperature) and bright (high luminosity). These stars have evolved from main sequence stars and are in a late stage of stellar evolution.
Do super giants have relatively high or low temperature?
Supergiants have relatively low temperatures compared to smaller stars like the Sun. Their surface temperatures typically range from 3,500 to 5,000 K. Despite their enormous size, they appear red or orange.
What is the difference between a red supergiant and a red giant?
A red supergiant is the largest type of star by volume, but not by mass. It is also one of the"coolest" active stars. These stars have fused most of their hydrogen to helium, and pressure from its core have swelled its size, to between 200 and 800 times the diameter of our Sun. Since the mass has not increased with the volume, the star's average density is comparatively low.
What type of stars have a very low temperature and a very high absolute magnitudes?
The red giants are very bright and have a relatively low temperature, but they are still red hot, that's why they glow red and not white. Have a look at Betelgeuse or Aldebaran in binoculars, or Antares if you get a chance in the summer, and compare them with a white star like Rigel or Vega.
What is a gigantism?
One of two groups of stars on the Hertzsprung -Russell diagram that have a different set of properties than the main sequence stars; bright, low-temperature giant stars that are enormously bright for their temperature.
What is a red gigant?
One of two groups of stars on the Hertzsprung -Russell diagram that have a different set of properties than the main sequence stars; bright, low-temperature giant stars that are enormously bright for their temperature.
What is revealed by the red color of the super giant star called Betelgeuse's?
A red color, in a star, is associated with a low surface temperature.
What is the temperature of a low mass red giant?
2000 to 4000 kelvin
Which types of star has low temperature and high luminosity?
A red giant star.
What is true about the absolute magnitude and temperature of supergiant stars?
Absolute magnitude: they are extremely bright. Temperature: their surface temperature is fairly low.
What is the star called that is after the Red Giant?
white dwarf if it has low mass Neutron star or Blackhole if it is massive enough to cause a red super giant
Where are cool red giant stars on the H-R?
Cool red giant stars are located in the upper right corner of the Hertzsprung-Russell diagram, where they are both cool (low temperature) and bright (high luminosity). These stars have evolved from main sequence stars and are in a late stage of stellar evolution.
What type of stars low temperature but high luminosity?
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
What type of stars has low temperature but high luminosity?
The red giants like Betelgeuse and Antares are bright and - relatively - cool.
What are super giants?
it is a very large star of high luminosity and low surface temperature.....=)))))
What must happen for a superconductor to work?
Super conductor will have zero resistance or zero resistivity. This happens when the temperature of the conductor reaches a very low temperature known as critical super conducting transition temperature. In case of mercury it will be 4.2K.
