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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
A unique dust formation episode in the SC-type star UY Centauri
Publications of the Astronomical Society of the Pacific, Volume 117, No. 835, Year 2005
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Description
We report the first detection of new dust formation in an SC star. The prototype of the SC stars, UY Cen, underwent a decline of 2 mag in the V band. The SC stars show pulsational variations and have 60 μm excesses, indicating past dust formation. It has been suggested that as a star evolves from being oxygen rich to carbon rich, there is a short period of time when C/O ∼ 1 during which the star appears spectroscopically as an SC star and ceases to produce dust. The SC star BH Cru has shown large spectroscopic and pulsation period variations over only 30 yr, indicating rapid evolution, but it has shown no sign of new dust formation. UY Cen has not shown any pulsation or spectroscopic variations accompanying the onset of its dust formation. In addition, UY Cen did not show emission in the resonance lines of Na I, K I, or Rb I when it was at its faintest, although these lines were a feature of the carbon stars R Lep and V Hya during similar faint phases. © 2005. The Astronomical Society of the Pacific. All rights reserved.
Authors & Co-Authors
Steinfadt, Justin D.R.
United States, Tucson
The University of Arizona
United States, Nantucket
Maria Mitchell Observatory
Clayton, Geoffrey C.
United States, Nantucket
Maria Mitchell Observatory
United States, Baton Rouge
Louisiana State University
Lloyd Evans, Tom
United Kingdom, St Andrews
University of st Andrews
Williams, Tom
South Africa, Cape Town
South African Astronomical Observatory
Statistics
Citations: 4
Authors: 4
Affiliations: 5
Identifiers
Doi:
10.1086/432848
Research Areas
Environmental