HD 181068: A red giant in a triply eclipsing compact hierarchical triple system

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DOIResolve DOI: http://doi.org/10.1126/science.1201762
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TypeArticle
Journal titleScience
ISSN0036-8075
Volume332
Issue6026
Pages216218; # of pages: 3
Subjecthierarchical system; interferometry; oscillation; photometer; spectroscopy; tidal cycle; friction; hierarchical triple system; motion; photometry; red giant star; theoretical model; tidal power; velocity
AbstractHierarchical triple systems comprise a close binary and a more distant component. They are important for testing theories of star formation and of stellar evolution in the presence of nearby companions. We obtained 218 days of Kepler photometry of HD 181068 (magnitude of 7.1), supplemented by ground-based spectroscopy and interferometry, which show it to be a hierarchical triple with two types of mutual eclipses. The primary is a red giant that is in a 45-day orbit with a pair of red dwarfs in a close 0.9-day orbit. The red giant shows evidence for tidally induced oscillations that are driven by the orbital motion of the close pair. HD 181068 is an ideal target for studies of dynamical evolution and testing tidal friction theories in hierarchical triple systems. Copyright 2011 by the American Association for the Advancement of Science; all rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number21271963
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Record identifiere8217bce-488a-41a0-b765-a2d6db4473c7
Record created2014-05-14
Record modified2016-05-09
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