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

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dc.contributor.utaustinauthorRao, N. Kameswaraen_US
dc.contributor.utaustinauthorLambert, David L.en_US
dc.creatorGarcia-Hernandez, D. A.en_US
dc.creatorRao, N. Kameswaraen_US
dc.creatorLambert, David L.en_US
dc.date.accessioned2016-10-28T19:38:49Z
dc.date.available2016-10-28T19:38:49Z
dc.date.issued2012-11en_US
dc.description.abstractWe 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.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipDirector's Discretionary Time (DDT) program 284.D-5048en_US
dc.description.sponsorshipSpanish Ministry of Economy and Competitiveness AYA-2011-27754en_US
dc.description.sponsorshipRobert A. Welch Foundation of Houston, Texas F-634en_US
dc.identifierdoi:10.15781/T2Q23R31B
dc.identifier.citationGarcía-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.en_US
dc.identifier.doi10.1088/2041-8205/759/1/l21en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/2152/43132
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectastrochemistryen_US
dc.subjectcircumstellar matteren_US
dc.subjectdust, extinctionen_US
dc.subjectism: moleculesen_US
dc.subjectstars: chemically peculiaren_US
dc.subjectstars: individual (dy cen)en_US
dc.subjectcoronae-borealis starsen_US
dc.subjectplanetary-nebulaeen_US
dc.subjectc-60en_US
dc.subjectabsorptionen_US
dc.subjectsearchen_US
dc.subjectdusten_US
dc.subjectc-70en_US
dc.subjecttransitionsen_US
dc.subjectenvelopesen_US
dc.subjectagben_US
dc.subjectastronomy & astrophysicsen_US
dc.titleHigh-Resolution Optical Spectroscopy of DY Cen: Diffuse Interstellar Bands in a Proto-Fullerene Circumstellar Environment?en_US
dc.typeArticleen_US

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