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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 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.
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 ☉. Although red supergiants are much cooler than the Sun, they are so much larger that they are highly luminous, typically tens or hundreds of thousands L ☉ . [ 9 ]
R Doradus (HD 29712 or P Doradus) is a red giant variable star in the far-southern constellation Dorado, close to the border with Reticulum. Its distance from Earth is 178 light-years (55 parsecs). Having a uniform disk diameter of 57 ± 5 mas, it is thought to be the extrasolar star with the largest apparent size as viewed from Earth.
New examinations of this behemoth star suggest it is both smaller — and closer — than astronomers believed. This red giant star will, one day, explode as a supernova. However, it is ...
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 [95] AD The nearest giant star to the Earth. Spica (α Virginis A) 7.47 ± 0.54 [101] One of the nearest supernova candidates and the sixteenth-brightest star in the night sky. Regulus (α Leonis A) 4.16 × 3.14 [102]
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 ...
Within any giant luminosity class, the cooler stars of spectral class K, M, S, and C, (and sometimes some G-type stars [13]) are called red giants. Red giants include stars in a number of distinct evolutionary phases of their lives: a main red-giant branch (RGB); a red horizontal branch or red clump; the asymptotic giant branch (AGB), although ...