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Red giant stars typically have high luminosities, often ranging from hundreds to thousands of times that of the Sun, due to their expanded outer layers and increased surface area. Their temperatures, however, are generally lower than those of main sequence stars, usually falling between 2,500 to 5,000 Kelvin. This combination of high luminosity and lower temperature gives red giants their characteristic reddish appearance.
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Which types of star has low temperature and high luminosity?
A red giant star.
Which star has a higher luminosity and a lower surface temperature than the sun Rigel Bernard's star Alpha Centauri or Aldebaran?
Aldebaran has a higher luminosity and a lower surface temperature than the Sun. Rigel has a higher luminosity but a higher surface temperature than the Sun. Bernard's Star and Alpha Centauri have lower luminosity and higher surface temperatures compared to the Sun.
How can a red giant become brighter if it now has a lower surface temperature?
A red giant can become brighter if its core temperature increases due to increased fusion reactions. Even though the surface temperature decreases, the overall luminosity of the star can increase if the core fusion rate intensifies, producing more energy.
When a star changes its position in the HR diagram it is because the star is?
evolving into a later stage. For example, a G2 star going into a red giant (M type)
If a star has a large luminosity and also a low surface temperature then it must have?
If a star has a large luminosity and a low surface temperature, it must have a large surface area to compensate for the low temperature and still emit a high amount of energy. This would make the star a red supergiant, a type of star that is both luminous and cool at the same time.
Which types of star has low temperature and high luminosity?
A red giant star.
What is a star of high luminosity called?
red giant
What is a large star of high luminosity called?
red giant
Which star has a higher luminosity and a lower surface temperature than the sun Rigel Bernard's star Alpha Centauri or Aldebaran?
Aldebaran has a higher luminosity and a lower surface temperature than the Sun. Rigel has a higher luminosity but a higher surface temperature than the Sun. Bernard's Star and Alpha Centauri have lower luminosity and higher surface temperatures compared to the Sun.
How can a red giant become brighter if it now has a lower surface temperature?
A red giant can become brighter if its core temperature increases due to increased fusion reactions. Even though the surface temperature decreases, the overall luminosity of the star can increase if the core fusion rate intensifies, producing more energy.
Explain how a red star can be more luminous than a bluish-white star?
A red star can be more luminous than a bluish-white star if it is larger in size and/or hotter in temperature. The luminosity of a star is determined by its size and temperature, with larger and hotter stars emitting more energy. Therefore, a red star that is larger and hotter than a bluish-white star can be more luminous.
When a star changes its position in the HR diagram it is because the star is?
evolving into a later stage. For example, a G2 star going into a red giant (M type)
What if the star has a bigger surface area but a smaller temperature how would that affect the luminosity?
As temperature decreases, luminosity will also decrease As radius increases (and with it surface area, but radius is a much easier to work with if you're trying to compare stars so we usually say radius) luminosity will also increase. If both are happening at the same time, it is possible that the luminosity of the star will remain more or less constant. Often one change will dominate the other, such as when a star goes through the red giant phase when the increase in radius has a far greater effect than the drop in temperature, and the star becomes more luminous.
If a star has a large luminosity and also a low surface temperature then it must have?
If a star has a large luminosity and a low surface temperature, it must have a large surface area to compensate for the low temperature and still emit a high amount of energy. This would make the star a red supergiant, a type of star that is both luminous and cool at the same time.
What is the average temperature of the red giant star?
Red giants have temperatures between about 5,000 and 6,700 degrees Fahrenheit.
What changes within the star (A) lead to the red giant (B)?
As a star exhausts its hydrogen fuel in the core, nuclear fusion ceases, causing the core to contract under gravity. This contraction increases temperature and pressure, triggering helium fusion and causing the outer layers to expand and cool, transforming the star into a red giant. The increased luminosity and size result from the energy produced in the shell surrounding the core, leading to the characteristic red hue of the giant phase.
Which two factors determine the characteristics of a star?
The two main factors that determine the characteristics of a star are its mass and its age. The mass of a star determines its temperature, size, luminosity, and lifespan. A star's age affects its stage in its life cycle, such as whether it is a young, main-sequence star or an older red giant.
