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The ejection of the outer mass and the creation of a planetary nebula finally ends the red-giant phase of the star's evolution. [10] The red-giant phase typically lasts only around a billion years in total for a solar mass star, almost all of which is spent on the red-giant branch.
In theoretical extreme mass loss models, sufficient hydrogen may be lost that helium becomes the most abundant element at the surface. When pre-red supergiant stars leave the main sequence, oxygen is more abundant than carbon at the surface, and nitrogen is less abundant than either, reflecting abundances from the formation of the star.
A red giant is a luminous giant star of low or intermediate mass that is in a late phase of its evolution. Subcategories This category has the following 7 subcategories, out of 7 total.
Evolution towards the red-giant branch for the first time is very rapid, whereas stars can spend much longer on the horizontal branch. Horizontal-branch stars, with more heavy elements and lower mass, are more unstable. Examples: Sigma Octantis (σ Octantis), an F-type giant and a Delta Scuti variable; Capella Aa (α Aurigae Aa), a G-type giant.
List of star systems within 80–85 light-years; List of star systems within 85–90 light-years; List of star systems within 90–95 light-years; List of star systems within 95–100 light-years; List of nearest stars by spectral type; List of nearest bright stars; List of brightest stars; List of nearest giant stars; List of nearest supergiants
The images show the surface of the star R. Doradus, a red giant star 180 light-years away in the Dorado constellation. The star has a diameter about 350 times that of the sun, and it serves as a ...
The red giant π1 Gruis is 530 light-years away, and it's reaching the end of its natural life. Soon, scientists think it will become a planetary nebula. But before it dies, astronomers are using ...
Infrared images show a red giant star, located 30,000 light years away near the center of the Milky Way. The star faded away and then reappeared over the course of several years. - Philip Lucas ...