xi Tauri: a unique laboratory to study the dynamic interaction in a compact hierarchical quadruple system

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dc.creator Nemravova, J. A.
dc.creator Harmanec, P.
dc.creator Broz, M.
dc.creator Vokrouhlicky, D.
dc.creator Mourard, D.
dc.creator Hummel, C. A.
dc.creator Cameron, C.
dc.creator Matthews, J. M.
dc.creator Bolton, C. T.
dc.creator Borzic, H.
dc.creator Guenther, David B.
dc.date.accessioned 2018-01-19T14:40:32Z
dc.date.available 2018-01-19T14:40:32Z
dc.date.issued 2016-10
dc.identifier.issn 1432-0746
dc.identifier.uri http://library2.smu.ca/handle/01/27247
dc.description Publisher's Version/PDF
dc.description.abstract Context. Compact hierarchical systems are important because the effects caused by the dynamical interaction among its members occur on a human timescale. These interactions play a role in the formation of close binaries through Kozai cycles with tides. One such system is xi Tauri: it has three hierarchical orbits: 7.14 d (eclipsing components Aa, Ab), 145 d (components Aa+Ab, B), and 51 yr (components Aa+Ab+B, C). Aims. We aim to obtain physical properties of the system and to study the dynamical interaction between its components. Methods. Our analysis is based on a large series of spectroscopic photometric (including space-borne) observations and long-baseline optical and infrared spectro-interferometric observations. We used two approaches to infer the system properties: a set of observation-specific models, where all components have elliptical trajectories, and an N-body model, which computes the trajectory of each component by integrating Newton’s equations of motion. Results. The triple subsystem exhibits clear signs of dynamical interaction. The most pronounced are the advance of the apsidal line and eclipse-timing variations.We determined the geometry of all three orbits using both observation-specific and N-body models. The latter correctly accounted for observed effects of the dynamical interaction, predicted cyclic variations of orbital inclinations, and determined the sense of motion of all orbits. Using perturbation theory, we demonstrate that prominent secular and periodic dynamical effects are explainable with a quadrupole interaction. We constrained the basic properties of all components, especially of members of the inner triple subsystem and detected rapid low-amplitude light variations that we attribute to co-rotating surface structures of component B. We also estimated the radius of component B. Properties of component C remain uncertain because of its low relative luminosity. We provide an independent estimate of the distance to the system. Conclusions. The accuracy and consistency of our results make xi Tau an excellent test bed for models of formation and evolution of hierarchical systems. en_CA
dc.language.iso en en_CA
dc.publisher EDP Sciences en_CA
dc.relation.uri http://dx.doi.org/10.1051/0004-6361/201628860
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Double stars
dc.subject.lcsh Eclipsing binaries
dc.subject.lcsh Stellar dynamics
dc.subject.lcsh Stars -- Orbits
dc.title xi Tauri: a unique laboratory to study the dynamic interaction in a compact hierarchical quadruple system en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astronomy & Astrophysics 594, A55. (2016) en_CA


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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: http://dx.doi.org/10.1051/0004-6361/201628860
 
 

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