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Many of the well-known bright stars are red giants because they are luminous and moderately common. The K0 RGB star Arcturus is 36 light-years away, and Gacrux is the nearest M-class giant at 88 light-years' distance. A red giant will usually produce a planetary nebula and become a white dwarf at the end of its life.
The 1984 report of a giant asymmetric dust shell 1 pc (206,265 AU) has not been corroborated by recent studies, although another published the same year said that three dust shells were found extending four light-years from one side of the decaying star, suggesting that Betelgeuse sheds its outer layers as it moves.
Arcturus is the brightest star in the constellation of Boötes. With an apparent visual magnitude of −0.05, Arcturus is the brightest star in the northern celestial hemisphere and the fourth-brightest star in the night sky, [14] after Sirius (−1.46 apparent magnitude), Canopus (−0.72) and α Centauri (combined
A bright cool giant star can easily be larger than a hotter supergiant. For example, Alpha Herculis is classified as a giant star with a radius of between 264 to 303 R ☉ while Epsilon Pegasi is a K2 supergiant of only 185 R ☉ .
This is the nearest red giant to the Earth, and the fourth brightest star in the night sky. Pollux (β Geminorum) 9.06 ± 0.03 [90] AD The nearest giant star to the Earth. Spica (α Virginis A) 7.47 ± 0.54 [96] One of the nearest supernova candidates and the sixteenth-brightest star in the night sky. Regulus (α Leonis A) 4.16 × 3.14 [97]
This red giant star will, one day, explode as a supernova. ... “It’s normally one of the brightest stars in the sky, but we’ve observed two drops in the brightness of Betelgeuse since late ...
First noted in October 2019, by February 2020, the star lost two-thirds of its brightness as seen from Earth. Red giant star Betelgeuse dimmed because it ‘sneezed,’ astronomers explain Skip to ...
While it is frequently described as a yellow supergiant, especially in evolutionary terms, [2] it is classified as a bright giant based on spectrum. [3] Sargas (θ Scorpii A) 329 ± 9 [5] F0Ib-F1III [6] or F0 II [7] 35.5 × 26.3 [5] 3.1 +0.37 −0.32 [5] 1.862 [8] Either a lower luminosity supergiant or a (bright) giant, formed after stellar ...