Three Newly Discovered M‐Dwarf Companions of Solar Neighborhood Stars | Zendy

J. Davy Kirkpatrick | Zendy; James Liebert | Zendy; Kelle L. Cruz | Zendy; John E. Gizis | Zendy; I. Neill Reid | Zendy

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Three Newly Discovered M‐Dwarf Companions of Solar Neighborhood Stars

Author(s) -

J. Davy Kirkpatrick,

James Liebert,

Kelle L. Cruz,

John E. Gizis,

I. Neill Reid

Publication year - 2001

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/322142

Subject(s) - physics , astrometry , stars , proper motion , photometry (optics) , astrophysics , solar mass , astronomy , stellar classification , neighbourhood (mathematics) , spectroscopy , brown dwarf , mathematical analysis , mathematics

We present low-resolution spectroscopy of newly-discovered candidatecompanions to three stars in the Solar Neighbourhood. All three companions areM dwarfs, with spectral types ranging from M4 to M9.5. In two cases, G85-55`B'(M6) and G87-9`B' (M4), we have circumstantial evidence from spectroscopy,photometry and limited astrometry that the systems are physical binaries; inthe third, G216-7B (M9.5), comparison of POSS II IIIaF plate material and the2MASS image indicates common proper motion. The primary star in this system,G216-7A (M0), appears itself to be an unresolved, nearly equal-mass binary. Allthree low-mass companions are highly likely to be stellar in nature, althoughG216-7B lies very close to the hydrogen-burning limit.Comment: Accepted for publication in PASP; 21 pages, 6 figure

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