The nearby young visual binary HIP 115147 and its common proper motion companion LSPM J2322 7847 - AstrophysicsReport as inadecuate




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Abstract: We report a late M-type, common proper motion companion to a nearby youngvisual binary HIP 115147 V368 Cep, separated by 963 arcseconds from theprimary K0 dwarf. This optically dim star has been identified as a candidatehigh proper motion, nearby dwarf LSPM J2322+7847 by L{\-e}pine in 2005. Thewide companion is one of the latest post-T Tauri low mass stars found within 20pc. We obtain a trigonometric parallax of $51.6\pm0.8$ mas, in good agreementwith the Hipparcos parallax of the primary star $50.7\pm0.6$ mas. Our $BVRI$photometric data and near-infrared data from 2MASS are consistent with LSPMJ2322+7847 being brighter by 1 magnitude in $K s$ than field M dwarfs at$V-K s=6.66$, which indicates its pre-main sequence status. We conclude thatthe most likely age of the primary HIP 115147 and its 11-arcsecond companionHIP 115147B is 20-50 Myr. The primary appears to be older than its close analogPZ Tel age 12-20 Myr and members of the TWA association 7 Myr.



Author: V. V. Makarov, N. Zacharias, G. S. Hennessy, H. C. Harris, A. K. B. Monet

Source: https://arxiv.org/







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