Issue |
Astron. Astrophys. Suppl. Ser.
Volume 119, Number 1, October I 1996
|
|
---|---|---|
Page(s) | 25 - 35 | |
DOI | https://doi.org/10.1051/aas:1996225 | |
Published online | 15 October 1996 |
Orbital elements for double stars of Population II. The system HD 29907*
Lund Observatory, Box 43, S-221 00 Lund, Sweden
Send offprint request to: H. Lindgren
Received:
4
January
1993
Accepted:
14
February
1996
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 MV=+6.6, 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
© European Southern Observatory (ESO), 1996