Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-03-23
Astronomy and Astrophysics
Astrophysics
11 pages with 2 tables and 4 figures in ApJ print page form. Accepted for publication in ApJ
Scientific paper
10.1086/321504
Infrared Space Observatory 3 - 25 $\mu$m spectra of the R Coronae Borealis stars V854 Cen, R CrB, and RY Sgr are presented and discussed. Sharp emission features coincident in wavelengths with the well known Unidentified Emission Features are present in the spectrum of V854 Cen but not of R CrB or RY Sgr. Since V854 Cen is not particularly H-poor and has a 1000 times more H than the other stars, the emission features are probably from a carrier containing hydrogen. There is a correspondence between the features and emission from laboratory samples of hydrogenated amorphous carbon. A search for C$_{60}$ in emission or absorption proved negative. Amorphous carbon particles account for the broad emission features seen between 6 - 14 $\mu$m in the spectrum of each star.
Ivans Inese I.
Kameswara Rao N.
Lambert David L.
Pandey Gajendra
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