%0 Generic %1 briceno2017binaries %A Briceno, Cesar %A Tokovinin, Andrei %D 2017 %K multiplicity speckle %T New binaries in the epsilon Cha association %U http://arxiv.org/abs/1709.05044 %X 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.

@misc{briceno2017binaries, abstract = {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 $\sim 900$ years, and a large mutual inclination.}, added-at = {2017-09-18T22:05:33.000+0200}, author = {Briceno, Cesar and Tokovinin, Andrei}, biburl = {https://www.bibsonomy.org/bibtex/2b75af8d07cbbd47550e83170f6412b67/superjenwinters}, description = {New binaries in the epsilon Cha association}, interhash = {c54cfad01ff9810183350736e03586a1}, intrahash = {b75af8d07cbbd47550e83170f6412b67}, keywords = {multiplicity speckle}, note = {cite arxiv:1709.05044Comment: 12 pages, 6 figures. Accepted for publication in The Astronomical Journal}, timestamp = {2017-09-18T22:05:33.000+0200}, title = {New binaries in the epsilon Cha association}, url = {http://arxiv.org/abs/1709.05044}, year = 2017 }