This is the first of a series of works devoted to investigate cool dwarfs in wide multiple systems. Here, I present Koenigstuhl 4 A and B, two bright, intermediate M dwarfs with a common high proper-motion and separated by 299 arcsec. At the most probable distance of the system, 19 pc, the projected physical separation is 5700 AU, which makes Koenigstuhl 4 AB to be one of the least bound binary systems with late-type components found to date. I also associate the primary with a ROSAT X-ray source for the first time.
@article{arxiv.1112.0691,
title = {Cool dwarfs in wide multiple systems: Paper I: Two mid-M dwarfs in a loosely-bound common-proper-motion pair},
author = {Jose A. Caballero},
journal= {arXiv preprint arXiv:1112.0691},
year = {2012}
}
Comments
The Observatory, Vol. 132, No. 1226, pages 1-7 [v2: corrected position angle in Tables III and IV]