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Red supergiants develop deep convection zones reaching from the surface over halfway to the core and these cause strong enrichment of nitrogen at the surface, with some enrichment of heavier elements. [26] Some red supergiants undergo blue loops where they temporarily increase in temperature before returning to the red supergiant state. This ...
Betelgeuse is a red supergiant that has evolved from an O-type main-sequence star. After core hydrogen exhaustion, Betelgeuse evolved into a blue supergiant before evolving into its current red supergiant form. [98] Its core will eventually collapse, producing a supernova explosion and leaving behind a compact remnant. The details depend on the ...
Mu Cephei (Latinized from μ Cephei, abbreviated Mu Cep or μ Cep), also known as Herschel's Garnet Star, Erakis, or HD 206936, is a red supergiant or hypergiant [4] [7] star in the constellation Cepheus. It appears garnet red and is located at the edge of the IC 1396 nebula.
UY Scuti is a dust-enshrouded bright red supergiant [16] and is classified as a semiregular variable with an approximate pulsation period of 740 days. [5] [17] [18] Based on an old radius of 1,708 R ☉, this pulsation would be an overtone of the fundamental pulsation period, or it may be a fundamental mode corresponding to a smaller radius. [19]
This is a list of the nearest supergiant stars to Earth, located at a distance of up to 1,100 light-years (340 parsecs) from Earth. Some of the brightest stars in the night sky, such as Rigel and Antares, are in the list.
Post-red supergiant stars have a generally higher level of nitrogen relative to carbon due to convection of CNO-processed material to the surface and the complete loss of the outer layers. Surface enhancement of helium is also stronger in post-red supergiants, representing more than a third of the atmosphere. [28] [29]
A red supergiant star orbited by a smaller B-type main-sequence star with a radius estimated between 13 [49] and 25 R ☉. [50] Widely recognised as being among the largest known stars. [19] Another estimate give a radius of 660 R ☉ [23] based on the Gaia DR3 distance of 1 kpc. [31] U Lacertae A 1,013 [23] L/T eff: KW Sagittarii: 1,009 ± 142 ...
AH Scorpii is a dust-enshrouded red supergiant [10] and is classified as a semiregular variable star with a main period of 714 days. The total visual magnitude range is 6.5 - 9.6. [ 2 ] No long secondary periods have been detected. [ 11 ]