Orbital elements for double stars of Population II. The system HD 29907.

Details Orbital elements for double stars of Population II. The system HD 29907. Orbital elements for double stars of Population II. The system HD 29907.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..119...25l&link_type=abstract

Astronomy and Astrophysics Supplement, v.119, p.25-35

Astronomy and Astrophysics

Astrophysics

4

Stars: Binaries: Spectroscopic, Stars: Kinematics, Stars: Population Ii, Stars: Subdwarfs, Stars: Hd 29907

Scientific paper

For HD 29907 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 G2 VI star. The secondary component remains unidentified. The absolute visual magnitude of the primary component is M_V_=+6.6, and the effective temperature and abundance of heavy elements are given by log T_e_=3.726 and [Fe/H]=-1.7, respectively. The V magnitude appears variable with a range of at least 0.12magnitudes. Colour indices appear stable. The system has a radial velocity of +67.6km/s, an orbital period of 29.9days and an eccentricity of 0.41. The total space velocity with respect to the galactic center is 340km/s and the object approaches escape velocity.

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