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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731553.0, MPI für Astronomie / Publikationen_mpia
Orbits in the T Tauri triple system observed with SPHERE
Authors:Köhler, R.; Kasper, M.; Herbst, T. M.; Ratzka, T.; Bertrang, G.-M.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Astronomy and Astrophysics
Start Page:id. A35 (8 pp)
Audience:Not Specified
Abstract / Description:<BR /> Aims: We present new astrometric measurements of the components in the T Tauri system and derive new orbits and masses. <BR /> Methods: T Tauri was observed during the science verification time of the new extreme adaptive optics facility SPHERE at the VLT. We combine the new positions with recalibrated NACO-measurements and data from the literature. Model fits for the orbits of T Tau Sa and Sb around each other and around T Tau N yield orbital elements and individual masses of the stars Sa and Sb. <BR /> Results: Our new orbit for T Tau Sa/Sb is in good agreement with other recent results, which indicates that enough of the orbit has been observed for a reliable fit. The total mass of T Tau S is 2.65 ± 0.11 M. The mass ratio MSb:MSa is 0.25 ± 0.03, which yields individual masses of MSa = 2.12 ± 0.10 M and MSb = 0.53 ± 0.06 M. If our current knowledge of the orbital motions is used to compute the position of the southern radio source in the T Tauri system, then we find no evidence of the proposed dramatic change in its path. Based on observations collected at the European Southern Observatory, Chile, proposals number 070.C-0162, 072.C-0593, 074.C-0699, 074.C-0396, 078.C-0386, 380.C-0179, 382.C-0324, 60.A-9363 and 60.A-9364.
Free Keywords:stars: pre-main sequence; stars: individual: T Tauri; stars: fundamental parameters; binaries: close; astrometry; celestial mechanics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201527125
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