Improved orbital solution and masses for the very low-mass multiple system LHS 1070
Abstract
We present a refined orbital solution for the components A, B, and C of the nearby late-M type multiple system LHS 1070. By combining astrometric datapoints from NACO/VLT, CIAO/SUBARU, and PUEO/CFHT, as well as a radial velocity measurement from the newly commissioned near infrared high-resolution spectrograph CRIRES/VLT, we achieve a very precise orbital solution for the B and C components and a first realistic constraint on the much longer orbit of the A-BC system. Both orbits appear to be co-planar. Masses for the B and C components calculated from the new orbital solution (M_(B+C) = 0.157 +/- 0.009 M_sun) are in excellent agreement with theoretical models, but do not match empirical mass-luminosity tracks. The preliminary orbit of the A-BC system reveals no mass excess for the A component, giving no indication for a previously proposed fourth (D) component in LHS 1070.
Keywords
Cite
@article{arxiv.0803.0628,
title = {Improved orbital solution and masses for the very low-mass multiple system LHS 1070},
author = {A. Seifahrt and T. Roell and R. Neuhaeuser and A. Reiners and F. Kerber and H. U. Kaeufl and R. Siebenmorgen and A. Smette},
journal= {arXiv preprint arXiv:0803.0628},
year = {2009}
}
Comments
published in A&A, 2008, 484, 429; added CFHT acknowledgement