NASA’s Hubble Spots Rare ‘Blue Lurker’ Star with Unusual Evolution in M67 Cluster
NASA’s Hubble Space Telescope has identified a rare stellar phenomenon known as the “blue lurker” within the open star cluster M67, approximately 2,800 light-years away. This intriguing star, part of a unique triple-star system, has drawn attention due to its unusual evolutionary history. Characterized by an accelerated spin rate and distinct features, the blue lurker rotates in just four days—significantly faster than the typical 30-day rotation period of Sun-like stars.
The Evolution of the Blue Lurker
According to a NASA press release, the blue lurker’s formation resulted from complex gravitational interactions within its triple-star system. Initially, two Sun-like stars formed a binary system, while the blue lurker orbited at a distance. Around 500 million years ago, the binary stars merged, creating a more massive star. This newly formed star then transferred material to the blue lurker, significantly increasing its rotation speed. Over time, the merged star evolved into a white dwarf, which the blue lurker now orbits.
Hubble’s Discoveries
Hubble’s ultraviolet spectroscopy confirmed the presence of the white dwarf companion, revealing a surface temperature of approximately 12,760°C and a mass of 0.72 solar masses. These findings support the theory of a stellar merger within the system. The blue lurker itself appears slightly bluer and brighter than typical stars, a result of the mass transfer process.
Scientific Impact and Future Exploration
Emily Leiner, a researcher at the Illinois Institute of Technology, highlighted the significance of this discovery in advancing our understanding of triple-star system dynamics. With around 10% of Sun-like stars forming in such systems, studying them provides valuable insights into stellar evolution and the creation of exotic celestial objects. While current models explaining these processes remain incomplete, this rare observation offers astronomers an exceptional opportunity to refine their theories.
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