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By analogy to the red giant branch for low-mass stars, this region is also called the blue giant branch. [2] They are larger than the Sun but smaller than a red supergiant , with surface temperatures of 10,000–50,000 K and luminosities from about 10,000 to a million times that of the Sun.
Blue giant is not a strictly defined term and it is applied to a wide variety of different types of stars. They have in common a moderate increase in size and luminosity compared to main-sequence stars of the same mass or temperature, and are hot enough to be called blue, meaning spectral class O, B, and sometimes early A.
This is a list of supernova candidates, or stars that are believed to soon become supernovae. ... Blue giant: II [6] Antares: 16 h 29 m 24.5 s –26° 25′ 55 ...
The most recent naked-eye supernova was SN 1987A, which was the explosion of a blue supergiant star in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. Theoretical studies indicate that most supernovae are triggered by one of two basic mechanisms: the sudden re-ignition of nuclear fusion in a white dwarf , or the sudden ...
Supernova 1987A is the bright star at the centre of the image, near the Tarantula Nebula. SN 1987A was a type II supernova in the Large Magellanic Cloud, a dwarf satellite galaxy of the Milky Way. It occurred approximately 51.4 kiloparsecs (168,000 light-years) from Earth and was the closest observed supernova since Kepler's Supernova in 1604.
The number of post-main sequence blue supergiants is greater than those expected from theoretical models, leading to the "blue supergiant problem". [23] The relative numbers of blue, yellow, and red supergiants is an indicator of the speed of stellar evolution and is used as a powerful test of models of the evolution of massive stars. [24]
In this binary system, a white dwarf (a dead star) and an ancient red giant (a slowly dying star) are gravitationally bound to each other. ... A nova differs from a supernova in that, during a ...
Blue loops can occur for red supergiants, red-giant branch stars, or asymptotic giant branch stars. Some stars may undergo more than one blue loop. Many pulsating variable stars such as Cepheids are blue loop stars. Stars on the horizontal branch are not generally referred to as on a blue loop even though they are temporarily hotter than on the ...