The surface temperature of a red giant is, at most, 5000 Kelvin.
A red giant star.
Red giants have temperatures between about 5,000 and 6,700 degrees Fahrenheit.
A red giant is called so because it appears red in color due to its lower surface temperature compared to a younger star. As it expands and cools during its later stages of evolution, it becomes larger and brighter, hence the name "red giant."
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.
The surface temperature of a red giant is, at most, 5000 Kelvin.
A red giant star.
It depends on how old it is
Red giants have temperatures between about 5,000 and 6,700 degrees Fahrenheit.
2000 to 4000 kelvin
Red giants have temperatures between about 5,000 and 6,700 degrees Fahrenheit.
A red giant is called so because it appears red in color due to its lower surface temperature compared to a younger star. As it expands and cools during its later stages of evolution, it becomes larger and brighter, hence the name "red giant."
According to Wikipedia, a red giant has a surface temperature of 5000 K or less.
Rasalgethi is a red giant with a temperature of 6,000 degrees.
The colour of a star is a good measure of the 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.
The surface temperature of a red giant star can range from about 2,600 to 3,700 degrees Celsius. This is relatively cooler compared to younger main sequence stars like the sun, which has a surface temperature of about 5,500 degrees Celsius.