Zeta Volantis

Zeta Volantis, Latinized from ζ Volantis, is a binary star^[6] system in the southern constellation of Volans. It has an apparent visual magnitude of 3.92,^[2] which is bright enough to be seen with the naked eye. Based upon parallax measurements by the Gaia spacecraft, it is approximately 145 light-years (44.6 parsecs) from the Sun. The companion is a magnitude 9.7 star at an angular separation of 16.7″.^[6] Based upon their motion through space, this system made its perihelion passage some 858,000 years ago when it came within 22 ly (6.6 pc) of the Sun.^[7] It is currently moving away with a radial velocity of 48 km/s.^[1]

ζ Volantis

Location of ζ Volantis
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Volans
Right ascension	07h 41m 49.2590s[1]
Declination	−72° 36′ 21.957″[1]
Apparent magnitude (V)	3.918±0.003 [2]
Characteristics
Evolutionary stage	Giant star
Spectral type	K0 III[3]
B−V color index	1.029±0.004[2]
Astrometry
Radial velocity (Rv)	48.5±0.14[1] km/s
Proper motion (μ)	RA: +36.179 mas/yr[1] Dec.: +14.816 mas/yr[1]
Parallax (π)	22.4377 ± 0.0947 mas[1]
Distance	145.4 ± 0.6 ly (44.6 ± 0.2 pc)[1]
Absolute magnitude (MV)	+0.75[4]
Details[2]
Mass	1.224±0.155 M☉
Radius	10.677±0.255 R☉
Luminosity	60[1] L☉
Surface gravity (log g)	2.82±0.09 cgs
Temperature	4,788±37 K
Metallicity [Fe/H]	−0.17±0.03 dex
Age	5.1±1.515 Gyr
Other designations
ζ Vol, CPD−72°627, FK5 297, HD 63295, HIP 37504, HR 3024, SAO 256438[5]
Database references
SIMBAD	data

The primary component is K-type giant star with a stellar classification of K0 III.^[3] It has a derived luminosity of around 60 times that of the Sun,^[1] 1.2 times the Sun's mass and is about 5.1 billion years old. At this age, it has expanded to 10.7 times the Sun's size.^[2] The expanded outer envelope has an effective temperature of 4,788 K,^[2] giving it the orange glow of a K-type star.^[8]

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (2021-02-01). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity". Astronomy and Astrophysics. 646: A77. arXiv:2012.10199. Bibcode:2021A&A...646A..77G. doi:10.1051/0004-6361/202039765. ISSN 0004-6361. Zeta Volantis' database entry at VizieR.
3. Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
4. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
5. "zet Vol -- High proper-motion Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-05.
6. 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, S2CID 14878976.
7. Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, S2CID 59039482, A35.
8. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2013-12-03, retrieved 2012-01-16.