A Precise Orbit Determination of χ1 Orionis from Astrometric and Radial Velocity Data

Details A Precise Orbit Determination of χ1 Orionis from Astrometric and Radial Velocity Data A Precise Orbit Determination of χ1 Orionis from Astrometric and Radial Velocity Data

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasp..114..224h&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 114, Issue 792, pp. 224-228.

Astronomy and Astrophysics

Astronomy

9

Stars: Binaries: Spectroscopic, Stars: Binaries: Visual, Stars: Individual: Constellation Name: Χ1 Orionis, Stars: Individual (Hd 39587)

Scientific paper

We have derived an accurate orbit of χ1 Orionis (HD 39587, HIP 27913, HR 2047) by combining precise astrometric and radial velocity data. The combined orbital analysis yields P=5156.7+/-2.5 days, K1=1.885+/-0.004 km s-1, α1=94.8+/-1.6 mas, e=0.451+/-0.003, and mass ratio (M2/M1) q=0.15+/-0.005. The mass ratio derived here is among the smallest well-determined ratio for a G-type dwarf primary star. We have also obtained a parallax of χ1 Orionis, 115.93+/-1.02 mas, in excellent agreement with the Hipparcos value.

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