Zeta Trianguli Australis
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Triangulum Australe |
| Right ascension | 16h 28m 28.1s |
| Declination | -70° 05′ 04″ |
| Apparent magnitude (V) | 4.90 |
| Characteristics | |
| Spectral type | F9 V (F6V + G1V) |
| U−B color index | 0.03 |
| B−V color index | 0.55[1] |
| Astrometry | |
| Radial velocity (Rv) | +7.6 km/s |
| Proper motion (μ) | RA: 199.88 mas/yr Dec.: 110.77 mas/yr |
| Parallax (π) | 82.61 ± 0.57 mas |
| Distance | 39.5 ± 0.3 ly (12.11 ± 0.08 pc) |
| Absolute magnitude (MV) | 4.49 |
| Details | |
| Metallicity [Fe/H] | –0.18[1] dex |
| Rotation | 13 days[1] |
| Age | 600–900[2] Myr |
| Other designations | |
Zeta Trianguli Australis (ζ TrA) is a spectroscopic binary in the constellation Triangulum Australe. It is approximately 39.5 light years from Earth.
The system is composed of two main sequence stars, one a yellow-white F-type dwarf and the other a yellow G-type dwarf. The binary's composite spectral class is F9V and its combined apparent magnitude is +4.90. The pair orbit each other once every 13 days, and the orbital eccentricity is 0.014.[3]
Somewhat surprisingly for a star located at 70° S, it is a candidate swarm member of the Ursa Major moving group.[4] However, there is some evidence to the contrary.[1]
References [edit]
- ^ a b c d Maldonado, J. et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics 521: A12, arXiv:1007.1132, Bibcode:2010A&A...521A..12M, doi:10.1051/0004-6361/201014948
- ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal 687 (2): 1264–1293, arXiv:0807.1686, Bibcode:2008ApJ...687.1264M, doi:10.1086/591785
- ^ Skuljan, Jovan (2004), "Accurate orbital parameters for the bright southern spectroscopic binary ζ Trianguli Australis – an interesting case of a near-circular orbit", Monthly Notices of the Royal Astronomical Society 352: 975, Bibcode:2004MNRAS.352..975S, doi:10.1111/j.1365-2966.2004.07988.x
- ^ Croswell, Ken (2005). "Descendants of the Dipper". Astronomy 33 (3): 40–45. ISSN 0091-6358.
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