Show simple item record

dc.creatorGarcia-Hernandez, D. Anibalen_US
dc.creatorRao, N. Kameswaraen_US
dc.creatorLambert, David L.en_US
dc.date.accessioned2016-04-28T19:40:29Z
dc.date.available2016-04-28T19:40:29Z
dc.date.issued2013-08en
dc.identifierdoi:10.15781/T2N23S
dc.identifier.citationGarc�a-Hern�ndez, D. A., N. Kameswara Rao, and D. L. Lambert. "Dust Around R Coronae Borealis Stars. II. Infrared Emission Features in an H-poor Environment." The Astrophysical Journal, Vol. 773, No. 2 (Aug., 2013): 107.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35077
dc.description.abstractResidual Spitzer/Infrared Spectrograph spectra for a sample of 31 R Coronae Borealis (RCB) stars are presented and discussed in terms of narrow emission features superimposed on the quasi-blackbody continuous infrared emission. A broad similar to 6-10 mu m dust emission complex is seen in the RCBs showing an extreme H-deficiency. A secondary and much weaker similar to 11.5-15 mu m broad emission feature is detected in a few RCBs with the strongest similar to 6-10 mu m dust complex. The Spitzer infrared spectra reveal for the first time the structure within the similar to 6-10 mu m dust complex, showing the presence of strong C-C stretching modes at similar to 6.3 and 8.1 mu m as well as of other dust features at similar to 5.9, 6.9, and 7.3 mu m, which are attributable to amorphous carbonaceous solids with little or no hydrogen. The few RCBs with only moderate H-deficiencies display the classical "unidentified infrared bands (UIRs)" and mid-infrared features from fullerene-related molecules. In general, the characteristics of the RCB infrared emission features are not correlated with the stellar and circumstellar properties, suggesting that the RCB dust features may not be dependent on the present physical conditions around RCB stars. The only exception seems to be the central wavelength of the 6.3 mu m feature, which is blueshifted in those RCBs showing also the UIRs, i.e., the RCBs with the smallest H deficiency.en_US
dc.description.sponsorshipNASA 1407, GO 50212en_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.language.isoEnglishen_US
dc.relation.ispartofen_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.subjectcircumstellar matteren_US
dc.subjectdust, extinctionen_US
dc.subjectinfrared: starsen_US
dc.subjectstars:en_US
dc.subjectchemically peculiaren_US
dc.subjectwhite dwarfsen_US
dc.subjecthydrogen-deficient carbonen_US
dc.subjectwhite-dwarf mergersen_US
dc.subjectplanetary-nebulaeen_US
dc.subjectcircumstellar environmenten_US
dc.subjectextreme heliumen_US
dc.subjectcno abundancesen_US
dc.subjectmoleculesen_US
dc.subjectnucleosynthesisen_US
dc.subjectspectrometeren_US
dc.subjectfullerenesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleDust Around R Coronae Borealis Stars. II. Infrared Emission Features In An H-Poor Environmenten_US
dc.typeArticleen_US
dc.description.departmentMcDonald Observatoryen_US
dc.identifier.Filename2013_08_rcoronaeborealis.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/773/2/107en_US
dc.contributor.utaustinauthorRao, N. Kameswaraen_US
dc.contributor.utaustinauthorLambert, David L.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record