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We report the first detection of new dust formation in an SC star. Theprototype of the SC stars, UY Cen, underwent a decline of 2 magnitudes in theV-band. The SC stars show pulsational variations and have 60 micron excessesindicating past dust formation. It has been suggested that as a star evolvesfrom oxygen rich to carbon rich, there is a short period of time when C/O$~1that the star appears spectroscopically as an SC star and ceases to producedust. The SC star, BH Cru, has shown large spectroscopic and pulsation periodvariations in only 30 years, indicating rapid evolution but it has shown nosign of new dust formation. UY Cen has not shown any pulsation or spectroscopicvariations accompanying the onset of its dust formation. In addition, UY Cendid not show emission in the resonance lines of Na I, K I or Rb I when it wasat its faintest, although these lines were a feature of the carbon stars R Lepand V Hya during similar faint phases.Comment: 15 pages,, 3 figures, PASP in press (September 2005

A Unique Dust Formation Episode in the SC‐Type Star UY Centauri