Bibcode
Velasco, S.; Rebolo, R.; Oscoz, A.; Mackay, C.; Labadie, L.; Pérez Garrido, A.; Crass, J.; Díaz-Sánchez, A.; Femenía, B.; González-Escalera, V.; King, D. L.; López, R. L.; Puga, M.; Rodríguez-Ramos, L. F.; Zuther, J.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 460, Issue 4, p.3519-3528
Fecha de publicación:
8
2016
Número de citas
16
Número de citas referidas
11
Descripción
We report high spatial resolution i' band imaging of the multiple T
Tauri system LkHα 262/LkHα 263 obtained during the first
commissioning period of the Adaptive Optics Lucky Imager (AOLI) at the
4.2-m William Herschel Telescope, using its Lucky Imaging mode. AOLI
images have provided photometry for each of the two components
LkHα 263 A and B (0.41 arcsec separation) and marginal evidence
for an unresolved binary or a disc in LkHα 262. The AOLI data
combined with previously available and newly obtained optical and
infrared imaging show that the three components of LkHα 263 are
comoving, that there is orbital motion in the AB pair, and, remarkably,
that LkHα 262-263 is a common proper motion system with less than
1 mas yr-1 relative motion. We argue that this is a likely
five-component gravitationally bounded system. According to BT-settl
models the mass of each of the five components is close to 0.4
M⊙ and the age is in the range 1-2 Myr. The presence of
discs in some of the components offers an interesting opportunity to
investigate the formation and evolution of discs in the early stages of
multiple very low mass systems. In particular, we provide tentative
evidence that the disc in 263C could be coplanar with the orbit of
263AB.