Free Access
Astron. Astrophys. Suppl. Ser.
Volume 119, Number 1, October_I 1996
Page(s) 25 - 35
Published online 15 October 1996
Orbital elements for double stars of Population II. <P> The system HD29907 DOI: 10.1051/aas:1996225

Astronomy and Astrophysics Supplement Series, Vol. 119, October I 1996, 25-35

Orbital elements for double stars of Population II.

The system HD29907 gif

H. Lindgren and A. Ardeberg

Send offprint requests to: H. Lindgren

Lund Observatory, Box 43, S-22100 Lund, Sweden

Received January 4, 1993; accepted February 14, 1996


For HD29907 results are presented from radial-velocity monitoring and from photometric observations on the uvby system. The object is a binary system at a distance of around 50 parsecs from the sun. The primary component is a G2VI star. The secondary component remains unidentified. The absolute visual magnitude of the primary component is , and the effective temperature and abundance of heavy elements are given by and [Fe/H]=-1.7, respectively. The V magnitude appears variable with a range of at least 0.12 magnitudes. Colour indices appear stable. The system has a radial velocity of , an orbital period of 29.9 days and an eccentricity of 0.41. The total space velocity with respect to the galactic center is 340 and the object approaches escape velocity.

Key words: stars: binaries: spectroscopic --- stars: kinematics --- stars: Population II --- stars: subdwarfs --- stars: HD 29907

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