Bibcode
Derekas, A.; Kiss, L. L.; Borkovits, T.; Huber, D.; Lehmann, H.; Southworth, J.; Bedding, T. R.; Balam, D.; Hartmann, M.; Hrudkova, M.; Ireland, M. J.; Kovács, J.; Mező, Gy.; Moór, A.; Niemczura, E.; Sarty, G. E.; Szabó, Gy. M.; Szabó, R.; Telting, J. H.; Tkachenko, A.; Uytterhoeven, K.; Benkő, J. M.; Bryson, S. T.; Maestro, V.; Simon, A. E.; Stello, D.; Schaefer, G.; Aerts, C.; ten Brummelaar, T. A.; De Cat, P.; McAlister, H. A.; Maceroni, C.; Mérand, A.; Still, M.; Sturmann, J.; Sturmann, L.; Turner, N.; Tuthill, P. G.; Christensen-Dalsgaard, J.; Gilliland, R. L.; Kjeldsen, H.; Quintana, E. V.; Tenenbaum, P.; Twicken, J. D.
Bibliographical reference
Science, Volume 332, Issue 6026, pp. 216- (2011).
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4
2011
Journal
Citations
97
Refereed citations
82
Description
Hierarchical 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.