HD 181068: A Red Giant in a Triply-Eclipsing Compact Hierarchical Triple System

Derekas, A. and Kiss, L. L. and Borkovits, T. and Huber, D. and Lehmann, H. and Southworth, J. and Bedding, T. R. and Balam, D. and Hartmann, M. and Hrudkova, M. and Ireland, M.J. and Kovács, J. and Mező, Gy. and Moór, A. and Niemczura, E. and Sarty, G.E. and Szabó, Gy. M. and Telting, J.H. and Tkachenko, A. and Uytterhoeven, K. and Benkő, József and Bryson, S.T. and Maestro, V and Simon, A. E. and Stello, D. and Schaefer, G and Aerts, C. and ten Brummelaar, T.A. and De Cat, P. and McAlister, H.A. and Maceroni, C and Merand, A. and Still, M and Sturmann, J. and Sturmann, L. and Turner, N. and Tuthill, P.G. and Christensen-Dalsgaard, J. and Gilliland, R.L. and Kjeldsen, H. and Quintana, E.V. and Tenenbaum, P. and Twicken, J.D. (2011) HD 181068: A Red Giant in a Triply-Eclipsing Compact Hierarchical Triple System. Science, 332 (6026). p. 216.

Preview

Text 1202.2196v1.pdf Download (431kB) | Preview

Abstract

Hierarchical triple systems comprise a close binary and a more distant compo- nent. They are important for testing theories of star formation and of stellar evolution in the presence of nearby companions. We obtained 218 days of Ke- pler 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.

Actions (login required)

Edit Item