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dc.creatorGreen, Joel D.en_US
dc.creatorRobertson, Paulen_US
dc.creatorBaek, Giseonen_US
dc.creatorPooley, Daviden_US
dc.creatorPak, Soojongen_US
dc.creatorIm, Myungshinen_US
dc.creatorLee, Jeong-Eunen_US
dc.creatorJeon, Yiseulen_US
dc.creatorChoi, Changsuen_US
dc.creatorMeschiari, Stefanoen_US
dc.date.accessioned2016-04-28T19:32:14Z
dc.date.available2016-04-28T19:32:14Z
dc.date.issued2013-02en
dc.identifierdoi:10.15781/T2380R
dc.identifier.citationGreen, Joel D., Paul Robertson, Giseon Baek, David Pooley, Soojong Pak, Myungshin Im, Jeong-Eun Lee, Yiseul Jeon, Changsu Choi, and Stefano Meschiari. "Variability at the Edge: Optical near/IR Rapid-Cadence Monitoring of Newly Outbursting FU Orionis Object HBC 722." The Astrophysical Journal, Vol. 764, No. 1 (Feb., 2013): 22.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34671
dc.description.abstractWe present the detection of day-timescale periodic variability in the r-band lightcurve of newly outbursting FU Orionis-type object HBC 722, taken from >42 nights of observation with the CQUEAN instrument on the McDonald Observatory 2.1 m telescope. The optical/near-IR lightcurve of HBC 722 shows a complex array of periodic variability, clustering around 5.8-day (0.044 mag amplitude) and 1.28-day (0.016 mag amplitude) periods, after removal of overall baseline variation. We attribute the unusual number of comparable strength signals to a phenomenon related to the temporary increase in accretion rate associated with FUors. We consider semi-random "flickering," magnetic braking/field compression and rotational asymmetries in the disk instability region as potential sources of variability. Assuming that the 5.8-day period is due to stellar rotation and the 1.28-day period is indicative of Keplerian rotation at the inner radius of the accretion disk (at 2 R-star), we derive a B-field strength of 2.2-2.7 kG, slightly larger than typical T Tauri stars. If instead the 5.8-day signal is from a disk asymmetry, the instability region has an outer radius of 5.4 R-star, consistent with models of FUor disks. Further exploration of the time domain in this complicated source and related objects will be key to understanding accretion processes.en_US
dc.description.sponsorshipUniversity Continuing Fellowshipen_US
dc.description.sponsorshipCreative Research Initiative program of the National Research Foundation of Korea (NRFK) 2010-0000712en_US
dc.description.sponsorshipKorean government (MEST)en_US
dc.description.sponsorshipBasic Science Research Program through the National Research Foundation of Korea (NRF)en_US
dc.description.sponsorshipMinistry of Education, Science and Technology 2012-0002330en_US
dc.description.sponsorshipW. J. McDonald Postdoctoral Fellowshipen_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.subjectstars: individual (hbc 722)en_US
dc.subjectstars: magneticen_US
dc.subjectfielden_US
dc.subjectstarspotsen_US
dc.subjectstars: variables: t tauri, herbig ae/been_US
dc.subjectt-tauri starsen_US
dc.subjectmagnetic-fielden_US
dc.subjectphotometric variabilityen_US
dc.subjectearly universeen_US
dc.subjectnorth-americaen_US
dc.subjectsystemen_US
dc.subjectsubmillimeteren_US
dc.subjectevolutionen_US
dc.subjectdisksen_US
dc.subjectplaneten_US
dc.subjectastronomy & astrophysicsen_US
dc.titleVariability At The Edge: Optical Near/IR Rapid-Cadence Monitoring Of Newly Outbursting FU Orionis Object HBC 722en_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2013_02_variabilityatedge.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/764/1/22en_US
dc.contributor.utaustinauthorGreen, Joel D.en_US
dc.contributor.utaustinauthorRobertson, Paulen_US
dc.contributor.utaustinauthorMeschiari, Stefanoen_US
dc.relation.ispartofserialAstrophysical Journalen_US


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