2013A&A...558A..80K


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.07CET12:26:41

2013A&A...558A..80K - Astronomy and Astrophysics, volume 558A, 80-80 (2013/10-1)

Orbits and masses in the young triple system TWA 5.

KOEHLER R., RATZKA T., PETR-GOTZENS M.G. and CORREIA S.

Abstract (from CDS):

We aim to improve the orbital elements and determine the individual masses of the components in the triple system TWA5. 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. 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±1.8pc, this yields a system mass of 0.9±0.1M, 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.

Abstract Copyright:

Journal keyword(s): stars: low-mass - brown dwarfs - stars: fundamental parameters - stars: individual: TWA 5 - binaries: close - celestial mechanics

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LP 881-64 ** 00 24 44.220360 -27 08 25.04904   17.18 15.338 13.502 11.403 M5.5/6Ve+M8.5Ve 118 0
2 V* T Tau TT* 04 21 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1239 2
3 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1436 1
4 NAME TW Hya Association As* 11 01.9 -34 42           ~ 795 0
5 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 168 0
6 CD-33 7795B BD* 11 31 55.4 -34 36 29     20.40   15.8 ~ 116 0
7 CCDM J11366-3334AB ** 11 36 34.94507 -33 34 12.2058   6.76 5.74     K0III 14 1

    Equat.    Gal    SGal    Ecl

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2019.12.07-12:26:41

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