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- Westerlund 1-75 ist ein Roter Überriese im Sternbild Altar. Er ist Teil des offenen Sternhaufens Westerlund 1, in dem noch drei weitere rote Überriesen, Westerlund 1-20, Westerlund 1-26 und Westerlund 1-237 bekannt sind. (de)
- Westerlund 1-75 or Wd 1-75 is a red supergiant (RSG) located in the Westerlund 1 super star cluster. Its radius is calculated to be around 668 solar radii (4.65 × 108 km, 3.10 au). This corresponds to a volume 298 million times bigger than the Sun. If placed at the center of the Solar System, Westerlund 1-75 would engulf the inner limits of the asteroid belt. The star is classified as a luminous cool supergiant emitting most of its energy in the infrared spectrum. It occupies the upper right corner of the Hertzsprung-Russell diagram. Using the effective temperature of 3,600 K, the bolometric luminosity of 68,000 L☉ and the solar effective temperature of 5,772 K, the radius of Westerlund 1-75 can be calculated using the Stefan-Boltzmann law at 668 R☉. Like Westerlund 1-20, Westerlund 1-26 and Westerlund 1-237, Westerlund 1-75 was observed to be a radio source, however it is weakest along the RSGs in its cluster and remains unresolved at any wavelength. Westerlund 1-75 is surrounded by extended nebula, although it appears less massive than nebulae around typical red supergiant stars. (en)
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- Westerlund 1 super star cluster. The location of Wd 1-75 is circled. (en)
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- Westerlund 1-75 ist ein Roter Überriese im Sternbild Altar. Er ist Teil des offenen Sternhaufens Westerlund 1, in dem noch drei weitere rote Überriesen, Westerlund 1-20, Westerlund 1-26 und Westerlund 1-237 bekannt sind. (de)
- Westerlund 1-75 or Wd 1-75 is a red supergiant (RSG) located in the Westerlund 1 super star cluster. Its radius is calculated to be around 668 solar radii (4.65 × 108 km, 3.10 au). This corresponds to a volume 298 million times bigger than the Sun. If placed at the center of the Solar System, Westerlund 1-75 would engulf the inner limits of the asteroid belt. Like Westerlund 1-20, Westerlund 1-26 and Westerlund 1-237, Westerlund 1-75 was observed to be a radio source, however it is weakest along the RSGs in its cluster and remains unresolved at any wavelength. (en)
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- Westerlund 1-75 (de)
- Westerlund 1-75 (en)
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