Astronomy: Red Giant Stars

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Source: Wikipedia (CC BY-SA)

Red Giant Stars A red giant is a luminous giant star of low or intermediate mass (roughly 0.3 –8 solar masses (M☉)) in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the radius large and the surface temperature around 5,000 K [K] (4,700 °C; 8,500 °F) or lower. The appearance of the red giant is from yellow-white to reddish-orange, including the spectral types K and M, sometimes G, but also class S stars and most carbon stars.

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Why Red Giant Stars matters: Stars are the engines of the cosmos -- they forge the chemical elements, light up galaxies, and create the conditions that make planets and life possi ble. Stars on the red-giant branch (RGB) are still fusing hydrogen into helium in a shell surrounding an inert helium core. Red-clump stars in the cool half of the horizontal branch fuse helium into carbon in their cores via the triple-alpha process. Asymptotic-giant-branch (AGB) stars have a helium-burning shell outside a degenerate carbon–oxygen core, and a hydrogen-burning shell just beyond that. 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.

Commentary

Source: Internal

Deep dive: Red Giant Stars Stars on the red-giant branch (RGB) are still fusing hydrogen into helium in a shell surrounding an inert helium core. Red-clump stars in the cool half of the horizontal branch fuse helium into carbon in their cores via the triple-alpha process. Asymptotic-giant-branch (AGB) stars have a helium-burning shell outside a degenerate carbon–oxygen core, and a hydrogen-burning shell just beyond that. 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. Source: https://en.wikipedia.org/wiki/Red_giant (Wikipedia, CC BY-SA)