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  2. Red giant - Wikipedia

    en.wikipedia.org/wiki/Red_giant

    The red-giant branch variable star Gamma Crucis is the nearest M-class giant star at 88 light-years. [25] The K1.5 red-giant branch star Arcturus is 36 light-years away. [ 26 ]

  3. R Aquarii - Wikipedia

    en.wikipedia.org/wiki/R_Aquarii

    The main Mira-type star is a red giant, and varies in brightness by a factor of several hundred and with a period of slightly more than a year; this variability was discovered by Karl Ludwig Harding in 1810. It has a distance of about 218 parsecs, [5] and is one of the nearest symbiotic stars and a well-known jet source. [11]

  4. Betelgeuse - Wikipedia

    en.wikipedia.org/wiki/Betelgeuse

    Rapidly-rotating 20 M ☉ stars take 9.3 million years to reach the red supergiant stage, while 20 M ☉ stars with slow rotation take only 8.1 million years. [173] These are the best estimates of Betelgeuse's current age, as the time since its zero age main sequence stage is estimated to be 8.0–8.5 million years as a 20 M ☉ star with no ...

  5. Detailed image of red giant confirms theory about massive stars

    www.aol.com/news/2018-01-30-detailed-image-of...

    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 ...

  6. Giant star - Wikipedia

    en.wikipedia.org/wiki/Giant_star

    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 ...

  7. Red giant star Betelgeuse dimmed because it ‘sneezed ... - AOL

    www.aol.com/red-giant-star-betelgeuse-dimmed...

    The dimming of Betelgeuse seen at the end of 2019 and the start of 2020 explained — the red giant star “sneezed.” Betelgeuse dimmed in the final few months of 2019, perplexing both ...

  8. The red giant star Betelgeuse is closer than we thought ... - AOL

    www.aol.com/news/red-giant-star-betelgeuse...

    In addition to new measurements of the star’s size and distance, this new study from Australian National University (ANU) suggests the star is not likely to erupt for 100,000 years. Betelgeuse ...

  9. R Cassiopeiae - Wikipedia

    en.wikipedia.org/wiki/R_Cassiopeiae

    R Cassiopeiae is a variable star in the northern constellation of Cassiopeia. It is located approximately 570 light years distant from the Sun, but is drifting closer with a radial velocity of −23 km/s. [5] This is a pulsating Mira-type variable star with a brightness that varies from magnitude +4.4 down to +13.5 over a period of 433.6 days. [3]