Orbits in the T Tauri triple system observed with SPHERE
Abstract
Aims: We present new astrometric measurements of the components in the T Tauri system and derive new orbits and masses.
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.
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 2016
- DOI:
- 10.1051/0004-6361/201527125
- arXiv:
- arXiv:1512.05736
- Bibcode:
- 2016A&A...587A..35K
- Keywords:
-
- stars: pre-main sequence;
- stars: individual: T Tauri;
- stars: fundamental parameters;
- binaries: close;
- astrometry;
- celestial mechanics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- accepted by A&