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Supergiants typically have surface gravities of around log(g) 2.0 cgs and lower, although bright giants (luminosity class II) have statistically very similar surface gravities to normal Ib supergiants. [20] Cool luminous supergiants have lower surface gravities, with the most luminous (and unstable) stars having log(g) around zero. [9]
A blue supergiant (BSG) is a hot, luminous star, often referred to as an OB supergiant. They are usually considered to be those with luminosity class I and spectral class B9 or earlier, [ 1 ] although sometimes A-class supergiants are also deemed blue supergiants.
While it is frequently described as a yellow supergiant, especially in evolutionary terms, [2] it is classified as a bright giant based on spectrum. [3] Sargas (θ Scorpii A) 329 ± 9 [5] F0Ib-F1III [6] or F0 II [7] 35.5 × 26.3 [5] 3.1 +0.37 −0.32 [5] 1.862 [8] Either a lower luminosity supergiant or a (bright) giant, formed after stellar ...
O class main sequence stars are already highly luminous. The giant phase for such stars is a brief phase of slightly increased size and luminosity before developing a supergiant spectral luminosity class. Type O giants may be more than a hundred thousand times as luminous as the sun, brighter than many supergiants.
The cD-type is a classification in the Yerkes galaxy classification scheme, one of two Yerkes classifications still in common use, along with D-type. [8] The "c" in "cD" refers to the fact that the galaxies are very large, hence the adjective supergiant, while the "D" refers to the fact that the galaxies appear diffuse. [9]
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 ...
A study describing a comparison of the observations published Thursday in the journal Astronomy & Astrophysics. ... WOH G64 is a red supergiant star 2,000 times larger than our sun, which has led ...
Supergiants are stars of luminosity class I. Luminosity class Ib is for normal supergiants; Luminosity class Ia is for bright supergiants; Luminosity class Iab is for ...