Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456..227w&link_type=abstract
ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP
Physics
Iso, R Crb Variables
Scientific paper
The R CrB stars are a group of carbon-rich, hydrogen-deficient, variable stars. The variability in the star results from the expulsion of a cloud of `soot' in the line of sight, causing the visual brightness of the star to fade by several magnitudes until the cloud of soot dissipates. Two members (R CrB and RY Sgr) were observed several times during the ISO mission with PHT-S (from 2.5 μm to 5 μm and from 5.8 μm to 11.6 μm) on ISO. The spectra were modelled with single temperature blackbody energy distributions. The four spectra of R CrB generally required two warm dust shells to model the data (one around 900 K to 950 K, the second around 380 K to 450 K). However the first spectrum of R CrB, which was taken during a fading episode, required a single temperature dust shell around 760 K ± 50 K. The three spectra obtained for RY Sgr showed similar behaviour, requiring two dust shells of varying temperature to model the data. A single spectrum of V854 Cen showed behaviour similar to the first spectrum of R CrB, in that the spectrum required a single warm shell with temperature 1000 K ± 50 K.
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