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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.
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.
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 ...
SN 1054 remnant (Crab Nebula)A supernova is an event in which a star destroys itself in an explosion which can briefly become as luminous as an entire galaxy.This list of supernovae of historical significance includes events that were observed prior to the development of photography, and individual events that have been the subject of a scientific paper that contributed to supernova theory.
A rare nova explosion will soon be visible in the Earth’s nighttime sky, according to officials at NASA. The event, which could occur anytime between now and September, is creating a buzz within ...
In 1956, the astronomers Feast and Thackeray used the term super-supergiant (later changed into hypergiant) for stars with an absolute magnitude brighter than M V = −7 (M Bol will be larger for very cool and very hot stars, for example at least −9.7 for a B0 hypergiant).
Alpha Lupi is a giant star with a stellar classification of B1.5 III. [4] It has about ten times the mass of the Sun [ 7 ] yet is radiating 18,000 times the Sun's luminosity. The outer atmosphere has an effective temperature of 24,550 K, [ 8 ] which gives it the blue-white glow of a B-type star .