Dust Around R Coronae Borealis Stars. I. Spitzer/Infrared Spectrograph Observations

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dc.contributor.utaustinauthorLambert, David L.en_US
dc.creatorGarcia-Hernandez, D. Anibalen_US
dc.creatorRao, N. Kameswaraen_US
dc.creatorLambert, David L.en_US
dc.date.accessioned2016-04-28T19:40:32Z
dc.date.available2016-04-28T19:40:32Z
dc.date.issued2011-09en
dc.description.abstractSpitzer/infrared spectrograph (IRS) spectra from 5 to 37 mu m for a complete sample of 31 R Coronae Borealis stars (RCBs) are presented. These spectra are combined with optical and near-infrared photometry of each RCB at maximum light to compile a spectral energy distribution (SED). The SEDs are fitted with blackbody flux distributions and estimates are made of the ratio of the infrared flux from circumstellar dust to the flux emitted by the star. Comparisons for 29 of the 31 stars are made with the Infrared Astronomical Satellite (IRAS) fluxes from three decades earlier: Spitzer and IRAS fluxes at 12 mu m and 25 mu m are essentially equal for all but a minority of the sample. For this minority, the IRAS to Spitzer flux ratio exceeds a factor of three. The outliers are suggested to be stars where formation of a dust cloud or dust puff is a rare event. A single puff ejected prior to the IRAS observations may have been reobserved by Spitzer as a cooler puff at a greater distance from the RCB. RCBs which experience more frequent optical declines have, in general, a circumstellar environment containing puffs subtending a larger solid angle at the star and a quasi-constant infrared flux. Yet, the estimated subtended solid angles and the blackbody temperatures of the dust show a systematic evolution to lower solid angles and cooler temperatures in the interval between IRAS and Spitzer. Dust emission by these RCBs and those in the LMC is similar in terms of total 24 mu m luminosity and [8.0]-[24.0] color index.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipSpanish Ministry of Science and Innovation (MICINN) AYA-2007-64748en_US
dc.description.sponsorshipNASA GO 50212, 1407en_US
dc.description.sponsorshipRobert A. Welch Foundation of Houston, Texas F-634en_US
dc.identifierdoi:10.15781/T2HC1W
dc.identifier.Filename2011_09_dustaroundrcoronae.pdfen_US
dc.identifier.citationGarc�a-Hern�ndez, D. An�bal, N. Kameswara Rao, and David L. Lambert. "Dust around R Coronae Borealis Stars. I. Spitzer/Infrared Spectrograph Observations." The Astrophysical Journal, Vol. 739, No. 1 (Sep., 2011): 37.en_US
dc.identifier.doi10.1088/0004-637x/739/1/37en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35078
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_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.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.subjecthigh-resolution spectroscopyen_US
dc.subjectspitzer-space-telescopeen_US
dc.subjectwhite-dwarf mergersen_US
dc.subjectrcb starsen_US
dc.subjectdy-perseien_US
dc.subjectinfrared photometryen_US
dc.subjectvariable-starsen_US
dc.subjectplanetary-nebulaeen_US
dc.subjectirasen_US
dc.subjectobservationsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleDust Around R Coronae Borealis Stars. I. Spitzer/Infrared Spectrograph Observationsen_US
dc.typeArticleen_US

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