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CIRCUMSTELLAR STRUCTURE AROUND EVOLVED STARS IN THE CYGNUS-X STAR FORMATION REGION

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dc.contributor.authorKraemer, Kathleen E.
dc.contributor.authorHora, Joseph L.
dc.contributor.authorEgan, Michael P.
dc.contributor.authorAdams, Joseph
dc.contributor.authorAllen, Lori E.
dc.contributor.authorBontemps, Sylvain
dc.contributor.authorCarey, Sean J.
dc.contributor.authorFazio, Giovanni G.
dc.contributor.authorGutermuth, Robert
dc.contributor.departmentUniversity of Massachusetts - Amherst
dc.date2023-09-22T22:10:40.000
dc.date.accessioned2024-04-26T08:26:35Z
dc.date.available2024-04-26T08:26:35Z
dc.date.issued2010-01-01
dc.descriptionThis is the pre-published version which is collected from arXiv. The published version is at http://iopscience.iop.org/1538-3881/139/6/2319/pdf/aj_139_6_2319.pdf
dc.description.abstractWe 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.description.pages2319-2329
dc.identifier.doihttps://doi.org/10.1088/0004-6256/139/6/2319
dc.identifier.urihttps://hdl.handle.net/20.500.14394/2818
dc.relation.ispartofThe Astronomical Journal
dc.relation.urlhttps://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1117&context=astro_faculty_pubs&unstamped=1
dc.source.issue6
dc.source.issue139
dc.source.statuspublished
dc.subjectstars: AGB and post-AGB – stars: individual (BD+43 3710
dc.subjectHBHA 4202-22
dc.subjectG79.29−0.46)
dc.subjectAstrophysics and Astronomy
dc.titleCIRCUMSTELLAR STRUCTURE AROUND EVOLVED STARS IN THE CYGNUS-X STAR FORMATION REGION
dc.typearticle
dc.typearticle
digcom.contributor.authorKraemer, Kathleen E.
digcom.contributor.authorHora, Joseph L.
digcom.contributor.authorEgan, Michael P.
digcom.contributor.authorAdams, Joseph
digcom.contributor.authorAllen, Lori E.
digcom.contributor.authorBontemps, Sylvain
digcom.contributor.authorCarey, Sean J.
digcom.contributor.authorFazio, Giovanni G.
digcom.contributor.authorisAuthorOfPublication|email:rgutermu@astro.umass.edu|institution:University of Massachusetts - Amherst|Gutermuth, Robert
digcom.identifierastro_faculty_pubs/121
digcom.identifier.contextkey1644884
digcom.identifier.submissionpathastro_faculty_pubs/121
dspace.entity.typePublication
relation.isAuthorOfPublication517832f5-30b3-41ea-bb56-15bc4f50ce97
relation.isAuthorOfPublication.latestForDiscovery517832f5-30b3-41ea-bb56-15bc4f50ce97
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