Journal
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS
Volume 37, Issue 8, Pages 550-562Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0320010811070011
Keywords
kinematics; solar analogs; HIP 87382; HIP 47399; solar neighborhood
Categories
Funding
- Russian Foundation for Basic Research [08-02-00400]
- Presidium of the Russian Academy of Sciences
- State Support for Leading Scientific Schools of the Russian Federation [NSh-3645.2010.2]
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We propose a kinematic approach to searching for the stars that could be formed with the Sun in a common parent open cluster. The approach consists in preselecting suitable candidates by the closeness of their space velocities to the solar velocity and analyzing the parameters of their encounters with the solar orbit in the past in a time interval comparable to the lifetime of stars. We consider stars from the Hipparcos catalog with available radial velocities. The Galactic orbits of stars have been constructed in the Allen-Santillan potential by taking into account the perturbations from the spiral density wave. We show that two stars, HIP 87382 and HIP 47399, are of considerable interest in our problem. Their orbits oscillate near the solar orbit with an amplitude of a parts per thousand 250 pc; there are short-term close encounters to distances < 10 pc. Both stars have an evolutionary status and metallicity similar to the solar ones.
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