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    High-Resolution Optical Spectroscopy of DY Cen: Diffuse Interstellar Bands in a Proto-Fullerene Circumstellar Environment?

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    2012_11_Garcia-Hernandez.pdf (402.8Kb)
    Date
    2012-11
    Author
    Garcia-Hernandez, D. A.
    Rao, N. Kameswara
    Lambert, David L.
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    Abstract
    We search high-resolution and high-quality VLT/UVES optical spectra of the hot R Coronae Borealis star DY Cen for electronic transitions of the C-60 molecule and diffuse interstellar bands (DIBs). We report the non-detection of the strongest C-60 electronic transitions (e. g., those at similar to 3760, 3980, and 4024 angstrom). The absence of C-60 absorption bands may support recent laboratory results, which show that the similar to 7.0, 8.5, 17.4, and 18.8 mu m emission features seen in DY Cen-and other similar objects with polycyclic-aromatic-hydrocarbon-like dominated IR spectra-are attributable to proto-fullerenes or fullerene precursors rather than to C-60. DIBs toward DY Cen are normal for its reddening; the only exception is the DIB at 6284 angstrom (possibly also the 7223 angstrom DIB) which is found to be unusually strong. We also report the detection of a new broad (FWHM similar to 2 angstrom) and unidentified feature centered at similar to 4000 angstrom. We suggest that this new band may be related to the circumstellar proto-fullerenes seen at infrared wavelengths.
    Department
    McDonald Observatory
    Subject
    astrochemistry
    circumstellar matter
    dust, extinction
    ism: molecules
    stars: chemically peculiar
    stars: individual (dy cen)
    coronae-borealis stars
    planetary-nebulae
    c-60
    absorption
    search
    dust
    c-70
    transitions
    envelopes
    agb
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/43132
    Citation
    García-Hernández, D. A., N. Kameswara Rao, and David L. Lambert. "High-resolution optical spectroscopy of DY Cen: diffuse interstellar bands in a proto-fullerene circumstellar environment?." The Astrophysical Journal Letters, Vol. 759, No. 1 (Nov., 2012): L21.
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