A Precise Orbit Determination of χ1 Orionis from Astrometric and Radial Velocity Data
Abstract
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.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- February 2002
- DOI:
- 10.1086/338367
- Bibcode:
- 2002PASP..114..224H
- Keywords:
-
- Stars: Binaries: Spectroscopic;
- Stars: Binaries: Visual;
- Stars: Individual: Constellation Name: χ1 Orionis;
- stars: individual (HD 39587)