Astronomy:Zeta Volantis

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Short description: Binary star in the constellation Volans
ζ Volantis
Volans IAU.svg
Red circle.svg
Location of ζ Volantis
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
Distance141.0 ± 0.7 ly
(43.2 ± 0.2 pc)
Absolute magnitude (MV)+0.75[5]
Details
Mass1.74[6] M☉
Radius11[7] R☉
Luminosity53[8] L☉
Surface gravity (log g)2.43±0.10[9] cgs
Temperature4,721±57[9] K
Metallicity [Fe/H]−0.18±0.05[9] dex
Age5.27[6] Gyr
Other designations
ζ Vol, CPD−72°627, FK5 297, HD 63295, HIP 37504, HR 3024, SAO 256438[10]
Database references
SIMBADdata

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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. 
  5. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  6. ↑ 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. ↑ 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. ↑ 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. ↑ 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. 
  10. ↑ "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. ↑ 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. 
  12. ↑ 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. ↑ 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. 
  14. ↑ "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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