Evidence Of Resonant Mode Coupling And The Relationship Between Low And High Frequencies In A Rapidly Rotating A Star

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dc.contributor.utaustinauthorBreger, Michelen_US
dc.contributor.utaustinauthorMontgomery, Michael H.en_US
dc.creatorBreger, Michelen_US
dc.creatorMontgomery, Michael H.en_US
dc.date.accessioned2016-04-28T19:39:22Z
dc.date.available2016-04-28T19:39:22Z
dc.date.issued2014-03en
dc.description.abstractIn the theory of resonant mode coupling, the parent and child modes are directly related in frequency and phase. The oscillations present in the fast rotating delta Sct star KIC 8054146 allow us to test the most general and generic aspects of such a theory. The only direct way to separate the parent and coupled (child) modes is to examine the correlations in amplitude variability between the different frequencies. For the dominant family of related frequencies, only a single mode and a triplet are the origins of nine dominant frequency peaks ranging from 2.93 to 66.30 cycles day(-1) (as well as dozens of small-amplitude combination modes and a predicted and detected third high-frequency triplet). The mode-coupling model correctly predicts the large amplitude variations of the coupled modes as a product of the amplitudes of the parent modes, while the phase changes are also correctly modeled. This differs from the behavior of " (n)ormal" combination frequencies in that the amplitudes are three orders of magnitude larger and may exceed even the amplitudes of the parent modes. We show that two dominant low frequencies at 5.86 and 2.93 cycles day(-1) in the gravity-mode region are not harmonics of each other, and their properties follow those of the almost equidistant high-frequency triplet. We note that the previously puzzling situation of finding two strong peaks in the low-frequency region related by nearly a factor of two in frequency has been seen in other delta Sct stars as well.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipAustrian Fonds zur Forderung der wissenschaftlichen Forschung P21830-N16en_US
dc.description.sponsorshipNorman Hackerman Advanced Research Program 003658-0252-2009en_US
dc.description.sponsorshipNational Science Foundation AST-0909107, AST-1312983en_US
dc.description.sponsorshipNASA NNX12AC96Gen_US
dc.identifierdoi:10.15781/T2JF9X
dc.identifier.Filename2014_03_evidenceresonant.pdfen_US
dc.identifier.citationBreger, Michel, and Michael H. Montgomery. "Evidence of resonant mode coupling and the relationship between low and high frequencies in a rapidly rotating A star." The Astrophysical Journal, Vol. 783, No. 2 (Mar., 2014): 89.en_US
dc.identifier.doi10.1088/0004-637x/783/2/89en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35039
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.subjectstars: individual (kic 8054146, kepler)en_US
dc.subjectstars: oscillationsen_US
dc.subjectstars:en_US
dc.subjectrotationen_US
dc.subjectstars: variables: delta scutien_US
dc.subjectdelta-scuti starsen_US
dc.subjectkic 8054146en_US
dc.subjectkepleren_US
dc.subjectregularitiesen_US
dc.subjectvariabilityen_US
dc.subjectspectraen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleEvidence Of Resonant Mode Coupling And The Relationship Between Low And High Frequencies In A Rapidly Rotating A Staren_US
dc.typeArticleen_US

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