NOAO >   Observing Info >   Approved Programs >   2010A-0141

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Proposal Information for 2010A-0141


PI: Szilard Csizmadia, German Aerospace Center, szilard.csizmadia@dlr.de
Address: Institute of Planetary Research, Rutherfordstrasse 2., Berlin 12489, Germany

CoI: Tamas Borkovits, Baja Astronomical Observatory, Hungary
CoI: Zsolt Paragi, Joint Institute for VLBI in Europe, The Netherlands
CoI: Laszlo Mosoni, Konkoly Observatory of HAS, Hungary
CoI: Juan Cabrera, German Aerospace Center, Germany

Title: 3D ORBITS IN THE HIERARCHICAL TRIPLE SYSTEM LAMBDA TAURI

Abstract: Hierarchical triple systems (a close binary star orbited by a distant third object) are frequent objects in the Galaxy. The key parameter (the strength of the perturbation) is the ratio of the orbital period of the third body to the orbital period of the close pair. The smaller the period ratio the larger the perturbations. Among the known systems, this ratio is the smallest in (lambda) Tauri, which consists of a B3V+A4IV eclipsing pair (P_orb=3.95 days) and a distant third object (K0V, P_orb=33 days). This system is crucial object for dynamical studies of this kind of the three-body problem, because the perturbations can cause extremely large changes in the orbital elements and the periods. The orientation of the orbital plane of the close pair is not known and the corresponding orbital elements can be determined only by interferometry which is the aim of our study.


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NOAO >   Observing Info >   Approved Programs >   2010A-0141

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