Westerlund 1-75: Difference between revisions
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Latest revision as of 21:32, 29 July 2024
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Westerlund 1 W75 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[1] (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.[2] It occupies the upper right corner of the Hertzsprung-Russell diagram. Using the effective temperature of 3,600 K,[1] the bolometric luminosity of 68,000 L☉[1] and the solar effective temperature of 5,772 K,[3] the radius of Westerlund 1-75 can be calculated using the Stefan-Boltzmann law at Template:Solar radius.Template:Nowrap
Like Westerlund 1-20, Westerlund 1 W26 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.[4]
Westerlund 1-75 is surrounded by extended nebula, although it appears less massive than nebulae around typical red supergiant stars.[5]