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dc.creatorGosnell, Natalie M.en_US
dc.creatorPooley, Daviden_US
dc.creatorGeller, Aaron M.en_US
dc.creatorKalirai, Jasonen_US
dc.creatorMathieu, Robert D.en_US
dc.creatorFrinchaboy, Peteren_US
dc.creatorRamirez-Ruiz, Enricoen_US
dc.date.accessioned2016-04-28T19:33:20Z
dc.date.available2016-04-28T19:33:20Z
dc.date.issued2012-01en
dc.identifierdoi:10.15781/T20515
dc.identifier.citationGosnell, Natalie M., David Pooley, Aaron M. Geller, Jason Kalirai, Robert D. Mathieu, Peter Frinchaboy, and Enrico Ramirez-Ruiz. "An Unexpected Discovery in the Rich Open Cluster NGC 6819 Using XMM-Newton." The Astrophysical Journal, Vol. 745, No. 1 (Jan., 2012): 57.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34726
dc.description.abstractWe present the first study of the X-ray population of the intermediate-age rich open cluster NGC 6819 using the XMM-Newton Observatory. In the past decade, Chandra X-ray observations have shown a relationship between the X-ray population of globular clusters and their internal dynamics and encounter frequency. We investigate the role dynamics possibly play in the formation of X-ray sources in NGC 6819, and compare our results with known properties of field and globular cluster X-ray populations. We implement a multi-wavelength approach to studying the X-ray sources, utilizing X-ray and UV data from XMM observations along with the wealth of photometry and radial-velocity data from the WIYN Open Cluster Study and the CFHT Open Cluster Survey. Within the cluster half-light radius, we detect 12 X-ray sources down to a luminosity of 10(30) erg s(-1) for cluster members. The sources include a candidate quiescent low-mass X-ray binary (qLMXB), a candidate cataclysmic variable, and two active binary systems. The presence of a qLMXB in an open cluster is previously unexpected given the known relationships between luminous X-ray sources and encounter frequency in globular clusters, and most likely has a dynamical origin.en_US
dc.description.sponsorshipXMM from the National Aeronautics and Space Administration NNX08AY27Gen_US
dc.description.sponsorshipNational Science Foundation AST-0908082en_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.subjectbinaries: closeen_US
dc.subjectopen clusters and associations: individual (ngc 6819)en_US
dc.subjectx-rays: binariesen_US
dc.subjectwiyn open clusteren_US
dc.subjectglobular-clustersen_US
dc.subjectx-rayen_US
dc.subjectcataclysmic variablesen_US
dc.subjectdynamical formationen_US
dc.subjectcompact binariesen_US
dc.subjectchamplane surveyen_US
dc.subjectdwarf novaeen_US
dc.subjectchandraen_US
dc.subjectevolutionen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleAn Unexpected Discovery In The Rich Open Cluster NGC 6819 Using XMM-Newtonen_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2012_01_unexpecteddiscovery.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/745/1/57en_US
dc.contributor.utaustinauthorPooley, Daviden_US
dc.relation.ispartofserialAstrophysical Journalen_US


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