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Pinwheels in the Quintuplet cluster.

Peter Tuthill1, John Monnier, Angelle Tanner

  • 1Physics Department, University of Sydney, New South Wales 2006, Australia. p.tuthill@physics.usyd.edu.au

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|August 19, 2006
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Astronomers have identified rotating spiral structures around five enigmatic cocoon stars in the Quintuplet cluster. These "pinwheel" nebulae indicate colliding-wind binary systems, resolving a long-standing debate about their nature.

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Area of Science:

  • Astronomy and Astrophysics
  • Stellar Evolution
  • Binary Star Systems

Background:

  • The Quintuplet cluster contains five mysterious cocoon stars with unusual thermal spectra and high luminosities.
  • Previous attributions for these stars ranged from young to evolved types, creating a debate among astronomers.

Purpose of the Study:

  • To resolve the debate surrounding the nature of the five enigmatic cocoon stars in the Quintuplet cluster.
  • To investigate the structural characteristics of these stars using advanced imaging techniques.

Main Methods:

  • Utilized diffraction-limited images obtained from the Keck 1 telescope.
  • Analyzed the morphology of the nebulae surrounding the cocoon stars.

Main Results:

  • Identified rotating spiral plumes, a characteristic feature of colliding-wind binary "pinwheel" nebulae.
  • Resolved the debate by confirming the stars are part of binary systems with colliding winds.

Conclusions:

  • The five cocoon stars in the Quintuplet cluster are identified as colliding-wind binary systems.
  • The observed spiral structures provide a definitive explanation for the stars' enigmatic properties.
  • These findings have implications for understanding Wolf-Rayet stars and supernovae light curves.