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- Westerlund 1-20 ist ein Roter Überriese im Sternbild Altar. Er ist Teil des offenen Sternhaufens Westerlund 1, in dem noch drei weitere rote Überriesen, Westerlund 1-26, Westerlund 1-75 und Westerlund 1-237 bekannt sind. (de)
- Westerlund 1-20 (abbreviated to Wd 1-20 or just W20) is a red supergiant (RSG) located in the Westerlund 1 super star cluster. Its radius was calculated to be around 965 solar radii (6.72 × 108 km, 4.48 au), making it one of the largest stars discovered so far. This corresponds to a volume 899 million times bigger than the Sun. If placed at the center of the Solar System, the photosphere of Westerlund 1-20 would almost reach the orbit of Jupiter. The star is classified as a luminous cool supergiant emitting most of its energy in the infrared spectrum. W20 occupies the upper right corner of the Hertzsprung-Russell diagram. Using the effective temperature of 3,500 K, the bolometric luminosity of 126,000 L☉ and the solar effective temperature of 5,772 K, its radius can be calculated using the Stefan-Boltzmann law. Westerlund 1-20 was observed to have an extended, cometary shaped nebula, similar to the other red supergiant Westerlund 1-26. It is therefore likely that its morphology was affected by either the intracluster medium or the cluster wind of Westerlund 1. The nebulae of both Westerlund 1-20 and Westerlund 1-26 are extended outward from the cluster core and most bright at inward direction, indicating the outward cluster wind. (en)
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- Westerlund 1 super star cluster. The location of Wd 1-20 is circled. (en)
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- Westerlund 1-20 ist ein Roter Überriese im Sternbild Altar. Er ist Teil des offenen Sternhaufens Westerlund 1, in dem noch drei weitere rote Überriesen, Westerlund 1-26, Westerlund 1-75 und Westerlund 1-237 bekannt sind. (de)
- Westerlund 1-20 (abbreviated to Wd 1-20 or just W20) is a red supergiant (RSG) located in the Westerlund 1 super star cluster. Its radius was calculated to be around 965 solar radii (6.72 × 108 km, 4.48 au), making it one of the largest stars discovered so far. This corresponds to a volume 899 million times bigger than the Sun. If placed at the center of the Solar System, the photosphere of Westerlund 1-20 would almost reach the orbit of Jupiter. (en)
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- Westerlund 1-20 (de)
- Westerlund 1-20 (en)
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