Cool dwarfs in wide multiple systems - Paper 3 Two common-proper-motion late-type stars separated by over 11 arcminutes
Abstract
LP 209-28 and LP 209-27 have similar proper motions as tabulated by several catalogues. Using seven astrometric epochs spanning 59 years, we confirm a common tangential velocity by measuring a constant angular separation of rho = 666.62+/-0.09 arcsec. Accurate SDSS and 2MASS photometry indicates that they are normal dwarfs of approximate spectral types K7 V and M3 V. However, from their apparent magnitudes, both LP 209-28 and LP 209-27 are located at 200-250 pc, from where one can deduce an astonishing projected physical separation of 0.6-0.8 pc. The system Koenigstuhl 6 AB represents another world record among the least-bound systems with low-mass star components.
- Publication:
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The Observatory
- Pub Date:
- August 2012
- DOI:
- 10.48550/arXiv.1205.5572
- arXiv:
- arXiv:1205.5572
- Bibcode:
- 2012Obs...132..252C
- Keywords:
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- Astrophysics - Galaxy Astrophysics
- E-Print:
- The Observatory, in press, to appear in August 2012