The unusual carbon-rich dust around the R CrB variables

Details The unusual carbon-rich dust around the R CrB variables The unusual carbon-rich dust around the R CrB variables

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..429w&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 429

Physics

1

Circumstellar Dust, Variable Stars

Scientific paper

When the dust shell around R CrB was observed with the low resolution spectrometer on ISO (ISOPHOT-S), from 2.5 to 5 μm and 5.8 to 11.6 μm, an unusual broad plateau of emission between 5 and 8 μm was found. Three further observations of R CrB were taken during the ISO mission, showing that the broad emission plateau varies in strength and shape. A second member of the R CrB class of stars, RY Sgr, was observed three times, and these spectra showed that RY Sgr has the same type of broad, variable plateau. A third member of the class, V854 Cen, has detectable hydrogen in its stellar atmosphere (R CrB and RY Sgr have very little hydrogen), and the ISOPHOT-S spectrum of the dust around this star showed PAH emission features as well as the plateau emission.

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