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Circumstellar Structure around Evolved Stars in the Cygnus-X Star Formation Region

dc.contributor.authorKRAEMER, Kathleen E.
dc.contributor.authorHORA, Joseph L.
dc.contributor.authorEGAN, Michael P.
dc.contributor.authorADAMS, Joseph
dc.contributor.authorALLEN, Lori E.
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorBONTEMPS, Sylvain
dc.contributor.authorCAREY, Sean J.
dc.contributor.authorFAZIO, Giovanni G.
dc.contributor.authorGUTERMUTH, Robert
dc.contributor.authorKETO, Eric
dc.contributor.authorKOENIG, Xavier P.
dc.contributor.authorMEGEATH, S. Thomas
dc.contributor.authorMIZUNO, Donald R.
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorMOTTE, Frederique
dc.contributor.authorPRICE, Stephan D.
dc.contributor.authorSCHNEIDER, N.
dc.contributor.authorSIMON, Robert
dc.contributor.authorSMITH, Howard
dc.date.created2010
dc.date.issued2010
dc.identifier.issn0004-6256
dc.description.abstractEnWe present observations of newly discovered 24 micron circumstellar structures detected with the Multiband Imaging Photometer for Spitzer (MIPS) around three evolved stars in the Cygnus-X star forming region. One of the objects, BD+43 3710, has a bipolar nebula, possibly due to an outflow or a torus of material. A second, HBHA 4202-22, a Wolf-Rayet candidate, shows a circular shell of 24 micron emission suggestive of either a limb-brightened shell or disk seen face-on. No diffuse emission was detected around either of these two objects in the Spitzer 3.6-8 micron Infrared Array Camera (IRAC) bands. The third object is the luminous blue variable candidate G79.29+0.46. We resolved the previously known inner ring in all four IRAC bands. The 24 micron emission from the inner ring extends ~1.2 arcmin beyond the shorter wavelength emission, well beyond what can be attributed to the difference in resolutions between MIPS and IRAC. Additionally, we have discovered an outer ring of 24 micron emission, possibly due to an earlier episode of mass loss. For the two shell stars, we present the results of radiative transfer models, constraining the stellar and dust shell parameters. The shells are composed of amorphous carbon grains, plus polycyclic aromatic hydrocarbons in the case of G79.29+0.46. Both G79.29+0.46 and HBHA 4202-22 lie behind the main Cygnus-X cloud. Although G79.29+0.46 may simply be on the far side of the cloud, HBHA 4202-22 is unrelated to the Cygnus-X star formation region.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enstars: AGB and post-AGB
dc.subject.enstars: individual: BD+43 3710 HBHA 4202-22 G79.29–0.46
dc.title.enCircumstellar Structure around Evolved Stars in the Cygnus-X Star Formation Region
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-6256/139/6/2319
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv1003.2437
bordeaux.journalThe Astronomical Journal
bordeaux.page2319-2329
bordeaux.volume139
bordeaux.issue6
bordeaux.peerReviewedoui
hal.identifierhal-00495996
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00495996v1
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