Astronomy:Zeta Volantis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Volans |
| Right ascension | 07h 41m 49.26100s[1] |
| Declination | −72° 36′ 21.9566″[1] |
| Apparent magnitude (V) | 3.93[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| B−V color index | +1.03[2] |
| Astrometry | |
| Radial velocity (Rv) | +48.1±0.7[4] km/s |
| Proper motion (μ) | RA: +33.34[1] mas/yr Dec.: +14.89[1] mas/yr |
| Parallax (π) | 23.13 ± 0.12[1] mas |
| Distance | 141.0 ± 0.7 ly (43.2 ± 0.2 pc) |
| Absolute magnitude (MV) | +0.75[5] |
| Details | |
| Mass | 1.74[6] M☉ |
| Radius | 11[7] R☉ |
| Luminosity | 53[8] L☉ |
| Surface gravity (log g) | 2.43±0.10[9] cgs |
| Temperature | 4,721±57[9] K |
| Metallicity [Fe/H] | −0.18±0.05[9] dex |
| Age | 5.27[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta Volantis, Latinized from ζ Volantis, is a binary star[11] system in the southern constellation of Volans. It has an apparent visual magnitude of 3.93,[2] which is bright enough to be seen with the naked eye. Based upon parallax measurements, it is approximately 141 light-years (43 parsecs) from the Sun.[1] The companion is a magnitude 9.7 star at an angular separation of 16.7″.[11] 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.[12] It is currently moving away with a radial velocity of 48 km/s.[4]
The primary component is K-type giant star with a stellar classification of K0 III.[3] It has a derived luminosity of around 53 times that of the Sun,[8] 1.74 times the Sun's mass and is about 5.27 billion years old.[6] The measured angular diameter of this star is 2.32±0.06 mas.[13] At the estimated distance of Zeta Volantis,[13] this yields a physical size of about 11 times the radius of the Sun.[7] The expanded outer envelope has an effective temperature of 4,721 K,[9] giving it the orange glow of a K-type star.[14]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 Cousins, A. W. J. (1977), "UCBV Magnitudes and Colours of South Circumpolar Stars", South African Astronomical Observatory Circulars 1: 51, Bibcode: 1977SAAOC...1...51C.
- ↑ 3.0 3.1 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 7.0 7.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41.. The radius (R*) is given by:
- [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(43.2\cdot 2.32\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 21.6\cdot R_{\bigodot} \end{align} }[/math]
- ↑ 8.0 8.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 9.0 9.1 9.2 9.3 Alves, S. et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society 448 (3): 2749–2765, doi:10.1093/mnras/stv189, Bibcode: 2015MNRAS.448.2749A.
- ↑ "zet Vol -- High proper-motion Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Zeta+Vol, retrieved 2016-09-05.
- ↑ 11.0 11.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics 575: 13, doi:10.1051/0004-6361/201425221, A35, Bibcode: 2015A&A...575A..35B.
- ↑ 13.0 13.1 Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R.
- ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16.
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