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Zeta Cygni (ζ Cyg) and CCDM J21129+3014B form a binary star system in the constellation Cygnus, approximately 151 light-years away from Earth. The main star, 3rd magnitude Zeta Cygni, is a yellow star of the spectral type G8III. It has a radius 14.7 times that of our Sun and shines 119 times brighter in comparison. Its most likely status is as a core-helium fusing giant star, although it could be in transition to gianthood with a tranquil helium core. Assuming the former, it has a mass 3.0 solar masses and an age of 400 million years. Zeta Cygni has an abundance of barium, and other heavy chemical elements, in its atmosphere.[1][3]
Zeta Cygni has a 12th magnitude companion, assumed to be a white dwarf. It orbits every 6489 days, or every 17.8 years. A theoretical study shows the system started off with solar masses of 3.0 and 2.5, but the more massive star lost some of its mass in becoming a white dwarf. It sent half a solar mass to Zeta Cygni, along with the heavy chemical elements it possesses today.[3]
[edit] References
- ^ a b Simbad Query Result. Simbad. Retrieved on October 18, 2007.
- ^ Simbad Query Result. Simbad. Retrieved on October 18, 2007.
- ^ a b "Zeta Cyg". Retrieved on October 17, 2007.
[edit] Stars components
CCDM J21129+3014B (Zeta Cygni B)
| Database references |
| SIMBAD |
data |
CCDM J21129+3014C (Zeta Cygni C)
| Database references |
| SIMBAD |
data |
CCDM J21129+3014D (Zeta Cygni D)
| Database references |
| SIMBAD |
data |
