Zeta Normae

Zeta Normae, Latinised from ζ Normae, is a solitary,[3] yellow-white hued star in the southern constellation of Norma. With an apparent visual magnitude of 5.81,[2] it is a dim star near the lower limit of visibility for the naked eye. Based upon an annual parallax shift of 14.98 mas as seen from Earth,[1] this system is located about 215 light years from the Sun. It is advancing in the general direction of the Sun with a radial velocity of −45.6 km/s.[4]

Zeta Normae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Norma
Right ascension 16h 13m 22.69701s[1]
Declination −55° 32′ 27.4140″[1]
Apparent magnitude (V) 5.81[2]
Characteristics
Spectral type F2 III[3]
B−V color index +0.34[2]
Astrometry
Radial velocity (Rv)−45.6±4.3[4] km/s
Proper motion (μ) RA: −99.75[1] mas/yr
Dec.: −42.28[1] mas/yr
Parallax (π)14.98 ± 0.32[1] mas
Distance218 ± 5 ly
(67 ± 1 pc)
Absolute magnitude (MV)1.67[5]
Details
Mass1.74[6] M☉
Luminosity16[7] L☉
Surface gravity (log g)3.70[6] cgs
Temperature6,691[7] K
Metallicity [Fe/H]−0.21[6] dex
Age1.50[6] Gyr
Other designations
ζ Nor, CD−55° 6596, HD 145361, HIP 79497, HR 6019, SAO 243449[8]
Database references
SIMBADdata

This is an evolved F-type giant star with a stellar classification of F2 III[3] that has swollen and cooled off the main sequence after consuming the hydrogen at its core. It is an estimated 1.5 billion years old with 1.74 times the mass of the Sun.[6] Zeta Normae is radiating approximately 16 times the Sun's luminosity from its photosphere at an effective temperature of 6,691 K.[7]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  4. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191.
  6. Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  7. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  8. "zet Nor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-12.
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