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- Title
Orbits and masses in the young triple system TWA 5.
- Authors
Köhler, R.; Ratzka, T.; Petr-Gotzens, M. G.; Correia, S.
- Abstract
Aims. We aim to improve the orbital elements and determine the individual masses of the components in the triple system TWA5. Methods. Five new relative astrometric positions in the H band were recorded with the adaptive optics system at the Very Large Telescope (VLT).We combine them with data from the literature and a measurement in the Ks band. We derive an improved fit for the orbit of TWA5Aa-b around each other. Furthermore, we use the third component, TWA5B, as an astrometric reference to determine the motion of Aa and Ab around their center of mass and compute their mass ratio. Results.We find an orbital period of 6.03± 0.01 years and a semi-major axis of 63.7± 0.2mas (3.2± 0.1AU).With the trigonometric distance of 50.1 ± 1.8 pc, this yields a system mass of 0.9 ± 0.1 M☉, where the error is dominated by the error of the distance. The dynamical mass agrees with the system mass predicted by a number of theoretical models if we assume that TWA5 is at the young end of the age range of the TW Hydrae association. We find a mass ratio of MAb/MAa = 1.3+0.6-0.4, where the less luminous component Ab is more massive. This result is likely to be a consequence of the large uncertainties due to the limited orbital coverage of the observations.
- Subjects
LOW mass stars; ORBITS (Astronomy); VERY large telescopes; BINARY stars; DYNAMICAL systems; CELESTIAL mechanics
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2013, Vol 558, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201220560