C. Briceno, and A. Tokovinin. (2017)cite arxiv:1709.05044Comment: 12 pages, 6 figures. Accepted for publication in The Astronomical Journal.
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 $900$ years, and a large mutual inclination.
%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
}