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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448097.0, MPI für Astronomie / Publikationen_mpia
Interferometric observations of the hierarchical triple system Algol
Authors:Csizmadia, Sz; Borkovits, T.; Paragi, Zs; Ábrahám, P.; Szabados, L.; Mosoni, L.; Sturmann, L.; Sturmann, J.; Farrington, C.; Mc Alister, H. A.; ten Brummelaar, T. A.; Turner, N. H.; Klagyivik, P.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Start Page:436
End Page:445
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Algol is a triple stellar system consisting of a close semidetached binary orbited by a third object. Due to the disputed spatial orientation of the close pair, the third body perturbation of this pair is a subject of much research. In this study, we determine the spatial orientation of the close pair orbital plane using the CHARA Array, a six-element optical/IR interferometer located on Mount Wilson, and state-of-the-art e-EVN interferometric techniques. We find that the longitude of the line of nodes for the close pair is Omega1 = 48° ± 2° and the mutual inclination of the orbital planes of the close and the wide pairs is 95° ± 3°. This latter value differs by 5° from the formerly known 100°, which would imply a very fast inclination variation of the system, not borne out by the photometric observations. We also investigated the dynamics of the system with numerical integration of the equations of motions using our result as an initial condition. We found large variations in the inclination of the close pair (its amplitude ~170°) with a period of about 20 millennia. This result is in good agreement with the photometrically observed change of amplitude in Algol's primary minimum.
Free Keywords:binaries: close; binaries: eclipsing; stars: individual: Algol Beta Persei
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: [ID No:1]
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