dc.contributor.author |
Garcia-Hernandez, D. A |
|
dc.contributor.author |
Kameswara Rao, N |
|
dc.contributor.author |
Lambert, D. L |
|
dc.date.accessioned |
2012-10-25T10:17:19Z |
|
dc.date.available |
2012-10-25T10:17:19Z |
|
dc.date.issued |
2012-11-01 |
|
dc.identifier.citation |
The Astrophysical Journal Letters, Vol. 759, No. 1, L21 |
en |
dc.identifier.uri |
http://hdl.handle.net/2248/5927 |
|
dc.description |
Open Access |
en |
dc.description.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 C60 molecule and diffuse interstellar bands (DIBs). We report the non-detection of the strongest C60 electronic transitions (e.g., those at ~3760, 3980, and 4024 Å). The absence of C60 absorption bands may support recent laboratory results, which show that the ~7.0, 8.5, 17.4, and 18.8 μm 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 C60. DIBs toward DY Cen are normal for its reddening; the only exception is the DIB at 6284 Å (possibly also the 7223 Å DIB) which is found to be unusually strong. We also report the detection of a new broad (FWHM ~ 2 Å) and unidentified feature centered at ~4000 Å. We suggest that this new band may be related to the circumstellar proto-fullerenes seen at infrared wavelengths. |
en |
dc.language.iso |
en |
en |
dc.publisher |
IOP Publishing |
en |
dc.relation.uri |
http://dx.doi.org/10.1088/2041-8205/759/1/L21 |
en |
dc.rights |
© IOP Publishing |
en |
dc.subject |
Astrochemistry |
en |
dc.subject |
Circumstellar matter |
en |
dc.subject |
Dust, extinction |
en |
dc.subject |
ISM: molecules |
en |
dc.subject |
Stars: chemically peculiar |
en |
dc.subject |
Stars: individual (DY Cen) |
en |
dc.title |
High-resolution Optical Spectroscopy of DY Cen: Diffuse Interstellar Bands in a Proto-fullerene Circumstellar Environment? |
en |
dc.type |
Article |
en |