PHASES Differential Astrometry and Iodine Cell Radial Velocities of the κ Pegasi Triple Star System | Zendy

Matthew W. Muterspaugh | Zendy; Benjamin F. Lane | Zendy; M. Konacki | Zendy; Sloane Wiktorowicz | Zendy; B. F. Burke | Zendy; M. M. Colavita | Zendy; S. R. Kulkarni | Zendy; M. Shao | Zendy

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PHASES Differential Astrometry and Iodine Cell Radial Velocities of the κ Pegasi Triple Star System

Author(s) -

Matthew W. Muterspaugh,

Benjamin F. Lane,

M. Konacki,

Sloane Wiktorowicz,

B. F. Burke,

M. M. Colavita,

S. R. Kulkarni,

M. Shao

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/498209

Subject(s) - physics , astrometry , parallax , radial velocity , astrophysics , astronomy , binary number , star (game theory) , line (geometry) , differential (mechanical device) , stars , geometry , arithmetic , mathematics , thermodynamics

kappa Pegasi is a well-known, nearby triple star system. It consists of a``wide'' pair with semi-major axis 235 milli-arcseconds, one component of whichis a single-line spectroscopic binary (semi-major axis 2.5 milli-arcseconds).Using high-precision differential astrometry and radial velocity observations,the masses for all three components are determined and the relativeinclinations between the wide and narrow pairs' orbits is found to be 43.8 +/-3.0 degrees, just over the threshold for the three body Kozai resonance. Thesystem distance is determined to 34.60 +/- 0.21 parsec, and is consistent withtrigonometric parallax measurements.

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