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"If that were the case, we should see many more supernovae explosions across the sky," Ziurys added. "People used to think these massive stars simply evolve into supernovae explosions, but we are no longer sure about that." "We are particularly interested in what hypergiant stars do at end of their lives," said Singh, a fourth-year doctoral student in Ziurys' lab. The team chose to study VY CMa because it is one of the best examples of these types of stars. "It is much larger, much more massive and undergoes violent mass eruptions every 200 years or so." "Think of it as Betelgeuse on steroids," said Ziurys, a Regents Professor with joint appointments in UArizona Department of Chemistry and Biochemistry and Steward Observatory, both part of the College of Science. Spanning anywhere from 10,000 to 15,000 astronomical units (with 1 AU being the average distance between Earth and the sun) VY CMa is possibly the most massive star in the Milky Way, according to Ziurys. Located about 3,009 light-years from Earth, VY Canis Majoris – or VY CMa, for short – is a pulsating variable star in the slightly southern constellation of Canis Major. Unlike stars with lower masses – which are more likely to puff up once they enter the red giant phase but generally retain a spherical shape – hypergiants tend to experience substantial, sporadic mass loss events that form complex, highly irregular structures composed of arcs, clumps and knots. Examples include Betelgeuse, the second brightest star in the constellation Orion, and NML Cygni, also known as V1489 Cygni, in the constellation Cygnus. The work was done with collaborators Robert Humphreys from the University of Minnesota and Anita Richards from the University of Manchester in the United Kingdom.Į xtreme supergiant stars known as hypergiants are very rare, with only a few known to exist in the Milky Way. Their findings, which they presented on June 13 at the 240th Meeting of the American Astronomical Society in Pasadena, California, offer insights, at an unprecedented scale, into the processes that accompany the death of giant stars. The team, led by UArizona researchers Ambesh Singh and Lucy Ziurys, traced the distribution, directions and velocities of a variety of molecules surrounding a red hypergiant star known as VY Canis Majoris. Olmsted, STScI.Ī University of Arizona-led team of astronomers has created a detailed, three-dimensional image of a dying hypergiant star.

Located about 3,009 light-years from Earth, VY Canis Majoris is possibly the most massive star in the Milky Way.

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