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Long-lasting observations of WOH G64– as soon as thought about the most severe red supergiant star in its galaxy– expose that the star has actually gone through a remarkable shift, potentially shedding part of its external layers as it went into a hotter and rarer excellent stage.
An artist’s restoration of the red supergiant WOH G64. Image credit: ESO/ L. Calçada.
Red supergiants are stars more than 8 times the mass of the Sun and have reasonably brief life expectancies, lasting simply 1-10 million years, before they ultimately take off as supernovae.
The development and fate of the most luminescent red supergiants stays unpredictable.
Because its discovery in the 1980s, WOH G64 has actually been thought about among the most luminescent, biggest, and coolest red supergiants in the Large Magellanic Cloud, a dwarf galaxy around 160,000 light-years far from our Solar System.
To examine the advancement of WOH G64, Dr. Gonzalo Muñoz-Sanchez from the National Observatory of Athens and his coworkers examined more than 30 years of brightness measurements starting in 1992, integrating them with brand-new and archived electro-magnetic spectra.
They discovered that the star went through quick modifications, at first dimming in 2011 before recuperating and ending up being more yellow and warmer– by more than 1,000 degrees Celsius– in 2013-2014.
In 2025, WOH G64 faded significantly and experienced modifications to its climatic chemistry.
This image, taken by the GRAVITY instrument on ESO’s Very Large Telescope Interferometer, reveals the red supergiant WOH G64. Image credit: ESO/ Ohnaka et aldoi: 10.1051/ 0004-6361/2024 51820.
To describe these advancements, the astronomers recommend 2 prospective circumstances.
“Firstly, WOH G64 might be a part of a binary star system in which the red supergiant transitioned into a yellow hypergiant due to an interaction that activated the ejection of a part of its environment,” they stated.
“In an alternative situation, a yellow hypergiant might have experienced an eruption of product that made it appear red for a number of years, ending in 2014.”
“The findings raise the concern of whether severe red supergiants, such as WHO G64, exist due to the fact that they are communicating binaries, and for that reason would not reach these severe states if they were single stars,” they included.
“Future interactions will figure out whether this star takes off as a supernova, collapses into a great void, or combines with its buddy.”
The research study was released in the journal Nature Astronomy
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G. Muñoz-Sanchez et alThe remarkable shift of the severe red supergiant WOH G64 to a yellow hypergiant. Nat Astronreleased online February 23, 2026; doi: 10.1038/ s41550-026-02789-7
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