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The brightest star in the Large Magellanic Cloud. S Doradus: 100 [127] Large Magellanic Cloud L/T eff: A luminous blue variable in the S Doradus instability strip. HD 37974: 99 [128] Large Magellanic Cloud L/T eff: An unusual blue hypergiant with a large dusty disk. [128] R136a1: 42.7 +1.6 −0.9 [129] Large Magellanic Cloud L/T eff
If we denote the acyclic chromatic number of a graph G by , we have that () , and in fact every star coloring of G is an acyclic coloring. The star chromatic number has been proved to be bounded on every proper minor closed class by Nešetřil & Ossona de Mendez (2003). This results was further generalized by Nešetřil & Ossona ...
The ancient Chinese called Antares 心宿二 (Xīnxiù'èr, "second star of the Heart"), because it was the second star of the mansion Xin (心). It was the national star of the Shang dynasty, and it was sometimes referred to as (Chinese: 火星; pinyin: Huǒxīng; lit. 'fiery star') because of its reddish appearance.
Color–color diagrams are often used in infrared astronomy to study star forming regions. Stars form in clouds of dust. As the star continues to contract, a circumstellar disk of dust is formed, and this dust is heated by the star inside. The dust itself then begins to radiate as a blackbody, though one much cooler than the star.
HD 140283 (also known as the Methuselah star) is a metal-poor subgiant star about 200 light years away from the Earth in the constellation Libra, near the boundary with Ophiuchus in the Milky Way Galaxy. Its apparent magnitude is 7.205, so it can be seen with binoculars. It is one of the oldest stars known.
The overall luminosity of the star decreases, its outer envelope contracts again, and the star moves from the red-giant branch to the horizontal branch. [6] [8], chapter 6. When the core helium is exhausted, a star with up to about 8 M ☉ has a carbon–oxygen core that becomes degenerate and starts helium burning in a shell. As with the ...
Altair is the brightest star in the constellation Aquila. α Aquilae (Latinised to Alpha Aquilae) is the star's Bayer designation. The traditional name Altair has been used since medieval times. It is an abbreviation of the Arabic phrase النسر الطائر Al-Nisr Al-Ṭa'ir, "the flying eagle ". [22]