Zusammenfassung
We present Adaptive Optics-aided speckle observations of 47 young stars in
the $\epsilon$ Cha association, made at the 4-m Southern Astrophysical Research
Telescope in the $I$-band. We resolved 10 new binary pairs, 5 previously known
binaries and two triple systems, also previously known. In the separation range
between 4 and 300 AU, the 30 association members of spectral types G0 and later
host 6 binary companions, leading to the raw companion frequency of
$0.010\pm0.04$ per decade of separation, comparable to the main sequence dwarfs
in the field. On the other hand, all 5 massive association members of spectral
types A and B have companions in this range. We discuss the newly resolved and
known binaries in our sample. Observed motions in the triple system $\epsilon$
Cha, composed of three similar B9V stars, can be described by tentative orbits
with periods 13 and $900$ years, and a large mutual inclination.
Nutzer