A precise radial-velocity determination of the orbit of Chi(1) Orionis

Details A precise radial-velocity determination of the orbit of Chi(1) Orionis A precise radial-velocity determination of the orbit of Chi(1) Orionis

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..101i&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, Feb. 1992, p. 101-105. Research supported by NSERC

Astronomy and Astrophysics

Astronomy

24

Astrometry, Astronomical Spectroscopy, Binary Stars, Radial Velocity, Stellar Orbits, Absorption Spectra, Least Squares Method, Orion Constellation, Parallax, Stellar Spectra

Scientific paper

A precise orbit of Chi(1) Orionis (G0 V, M(v) = 4.4) was determined using radial velocities observed with our HF absorption-cell technique and previous Sproul astrometric observations. Least-squares analysis yields a photocentric semimajor axis alpha(p) = 0.082 +/- 0.004 arcsec, a radial-velocity amplitude K = 1886 +/- 6 m/s, and a period P = 14.21 +/- 0.06 yr. The results imply that the secondary has a mass of 0.15 +/- 0.01 solar mass, the minimum parallax of the system is pi = 0.102 +/- 0.005 arcsec, and the secondary is fainter than M(v) = 8.8.

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