Zeta Tucanae

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Zeta Tucanae
Tucana constellation map.png
Location of ζ Tucanae (near center).
Observation data
Epoch J2000      Equinox J2000
Constellation Tucana
Right ascension 00h 20m 04.25995s[1]
Declination −64° 52′ 29.2549″[1]
Apparent magnitude (V) 4.23
Characteristics
Spectral type F9.5 V[2]
U−B color index 0.02[3]
B−V color index 0.58[3]
Variable type None[4]
Astrometry
Radial velocity (Rv) 8.8 ± 0.02[5] km/s
Proper motion (μ) RA: 1,707.42[1] mas/yr
Dec.: 1,164.30[1] mas/yr
Parallax (π) 116.46 ± 0.16[1] mas
Distance 28.01 ± 0.04 ly
(8.59 ± 0.01 pc)
Absolute magnitude (MV) 4.67[6]
Details
Mass 0.99 ± 0.02[7] M
Radius 1.08 ± 0.08[8] R
Luminosity 1.26[8] L
Surface gravity (log g) 4.48[9] cgs
Temperature 5,970[9] K
Metallicity [Fe/H] −0.07[9] dex
Rotational velocity (v sin i) 3.0[10] km/s
Age 2.1–3.02[11][12] Gyr
Other designations
FK5 10, GCTP 54, GJ 17, HD 1581, HIP 1599, HR 77, LHS 5, LTT 167, SAO 248163, GC 401, LPM 16, LFT 36.[13]

Zeta Tucanae (ζ Tuc, ζ Tucanae) is a star in the constellation Tucana. It is a spectral class F9.5 main sequence star with an apparent magnitude of +4.23. Despite having a slightly lower mass, this star is more luminous than the Sun.[7] Based upon parallax measurements by the Hipparcos spacecraft, it is approximately 28.0 light years from Earth.[1] This is one of the least variable stars observed during the Hipparcos mission.[4][14]

The composition and mass of this star are very similar to the Sun, with a slightly lower mass and an estimated age of three billion years. The solar-like qualities make it a target of interest for investigating the possible existence of a life-bearing planet.[14]

Based upon an excess emission of infrared radiation at 70 micrometres, this system is believed to have a debris disk. The disk is orbiting the star at a minimum radius of 2.3 astronomical units. It is radiating with a maximum temperature of 218 K.[11] As of 2009, no planet has been discovered in orbit around this star.[15]

The components of this star's space velocity are U = −60, V = −4 and W = −38 km/s. These correspond to the velocity toward the galactic center, the velocity along the direction of galactic rotation, and the velocity toward the north galactic pole, respectively.[16] It is orbiting through the galaxy at a mean distance of 8.4 kpc from the galactic center and with an orbital eccentricity of 0.16.[14]

References[edit]

  1. ^ a b c d e f van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357  Note: see VizieR catalogue I/311.
  2. ^ Gray, R. O. et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637 
  3. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode:1966CoLPL...4...99J. 
  4. ^ a b Adelman, S. J. (February 2001). "Research Note Hipparcos photometry: The least variable stars". Astronomy and Astrophysics 367 (1): 297–298. Bibcode:2001A&A...367..297A. doi:10.1051/0004-6361:20000567. 
  5. ^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. pp. 57–63. Bibcode:1967IAUS...30...57E. 
  6. ^ Elgarøy, Øystein; Engvold, Oddbjørn; Lund, Niels (March 1999), "The Wilson-Bappu effect of the MgII K line - dependence on stellar temperature, activity and metallicity", Astronomy and Astrophysics 343: 222–228, Bibcode:1999A&A...343..222E 
  7. ^ a b Santos, N. C.; Israelian, G.; Mayor, M. (July 2001). "The metal-rich nature of stars with planets". Astronomy and Astrophysics 373 (3): 1019–1031. arXiv:astro-ph/0105216. Bibcode:2001A&A...373.1019S. doi:10.1051/0004-6361:20010648. 
  8. ^ a b Ghezzi, L. et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290 
  9. ^ a b c Castro, S.; Porto de Mello, G. F.; da Silva, L. (May 1999). "Copper and barium abundances in the Ursa Major Moving Group". Monthly Notices of the Royal Astronomical Society 305 (3): 693–700. arXiv:astro-ph/9901209. Bibcode:1999MNRAS.305..693C. doi:10.1046/j.1365-8711.1999.02455.x. 
  10. ^ O'Toole, S. J. et al. (2009). "The Frequency of Low-mass Exoplanets". The Astrophysical Journal 701 (2): 1732–1741. arXiv:0906.4619. Bibcode:2009ApJ...701.1732O. doi:10.1088/0004-637X/701/2/1732. 
  11. ^ a b Trilling, D. E.; et al. (2008). "Debris Disks around Sun-like Stars". The Astrophysical Journal 674 (2): 1086–1105. arXiv:0710.5498. Bibcode:2008ApJ...674.1086T. doi:10.1086/525514. 
  12. ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (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. 
  13. ^ "LHS 5 -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-05-21. 
  14. ^ a b c Porto de Mello, Gustavo; del Peloso, Eduardo F.; Ghezzi, Luan (2006). "Astrobiologically Interesting Stars Within 10 Parsecs of the Sun". Astrobiology 6 (2): 308–331. arXiv:astro-ph/0511180. Bibcode:2006AsBio...6..308P. doi:10.1089/ast.2006.6.308. PMID 16689649. 
  15. ^ Kóspál, Ágnes; Ardila, David R.; Moór, Attila; Ábrahám, Péter (August 2009). "On the Relationship Between Debris Disks and Planets". The Astrophysical Journal Letters 700 (2): L73–L77. arXiv:0907.0028. Bibcode:2009ApJ...700L..73K. doi:10.1088/0004-637X/700/2/L73. 
  16. ^ Woolley, Richard van der Riet (1970). "Catalogue of Stars within 25 Parsecs of the Sun". Royal Observatory Annals (Herstmonceux, Royal Greenwich Observatory) 5. Retrieved 2009-09-02. 

External links[edit]