ZETA HERCULIS

'Zeta Herculis' (ζ Her, ζ Herculis) is a binary star system in the constellation Hercules. The primary star is a sub-giant that is somewhat larger than the Sun and has just begun to evolve away from the main sequence. It is orbited by a smaller and fainter star that is separated from the primary by just over 1 arcsec. The stars orbit each other with a period of 34.5 years and a semi-major axis of 1.36".
This system forms part of the ''Zeta Herculis moving group'' of stars. This group includes: φ² Pavonis, ζ Reticuli, 1 Hydra, Gl 456, Gl 678, and Gl 9079.^[1]

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References

1. On the physical existence of the Zeta HER moving group - A detailed analysis of Phi exp 2 Pavonis, G. F. Porto de Mello, L. da Silva, , , Astronomical Journal, 1991

External links

★ Gl 635

★ HD 150680 — Spectroscopic binary

★ Zeta Herculis Prof. Jim Kaler