Astronomy:Tau3 Eridani

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Short description: A-type star in the constellation Eridanus
For other star systems with this Bayer designation, see Astronomy:Tau Eridani.
τ3 Eridani
Location of τ3 Eridani (circled in red)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Eridanus
Right ascension  03h 02m 23.49939s[1]
Declination −23° 37′ 28.0936″[1]
Apparent magnitude (V) 4.10[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A3 IV-V[4]
U−B color index +0.08[2]
B−V color index +0.16[2]
Astrometry
Radial velocity (Rv)−9.8[5] km/s
Proper motion (μ) RA: −147.25[1] mas/yr
Dec.: −55.28[1] mas/yr
Parallax (π)36.80 ± 0.18[1] mas
Distance88.6 ± 0.4 ly
(27.2 ± 0.1 pc)
Absolute magnitude (MV)+1.91[6]
Details
Mass1.78[7] M☉
Radius1.9[8] R☉
Luminosity13.7[9] L☉
Surface gravity (log g)4.17[7] cgs
Temperature8,251±281[7] K
Metallicity [Fe/H]−0.21[4] dex
Rotational velocity (v sin i)133[10] km/s
Age476[7] Myr
Other designations
τ3 Eri, 11 Eri, CD−24 1387, CPD−24 358, GJ 121, HD 18978, HIP 14146, HR 919, SAO 168249[11]
Database references
SIMBADdata

Tau3 Eridani, Latinized from τ3 Eridani, is a star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.10.[2] Using the parallax method,[1] the distance to this star can be estimated as 88.6 light years. In 2001 it was reported as a candidate Vega-like star, meaning it appears to radiate an infrared excess from an orbiting circumstellar disk.[12] However, this has not been confirmed.[13]

This is an A-type star with a stellar classification of A3 IV-V.[4] The luminosity class of IV-V indicates the spectrum displays traits intermediate between a main sequence and subgiant star. It is around 476[7] million years old and is spinning rapidly with a projected rotational velocity of 133 km/s.[10] This is creating an equatorial bulge that might be 7% wider than the polar radius.[14] Tau3 Eridani has 178%[7] of the Sun's mass and nearly double the radius of the Sun.[8] The star shines with 13.7 times the solar luminosity from an outer atmosphere at an effective temperature of 8,251 K.[7]

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 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M. 
  3. ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 4.2 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, doi:10.1086/504637, Bibcode: 2006AJ....132..161G. 
  5. ↑ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington, D.C.), Bibcode: 1953GCRV..C......0W. 
  6. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 David, Trevor J.; Hillenbrand, Lynne A. (May 2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 38, doi:10.1088/0004-637X/804/2/146, 146, Bibcode: 2015ApJ...804..146D. 
  8. ↑ 8.0 8.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  9. ↑ 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. 
  10. ↑ 10.0 10.1 Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R. 
  11. ↑ "tau03 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tau03+Eri. 
  12. ↑ Song, Inseok et al. (January 2001), "Ages of A-Type Vega-like Stars from uvbyβ Photometry", The Astrophysical Journal 546 (1): 352–357, doi:10.1086/318269, Bibcode: 2001ApJ...546..352S. 
  13. ↑ Gáspár, András et al. (May 2013), "The Collisional Evolution of Debris Disks", The Astrophysical Journal 768 (1): 29, doi:10.1088/0004-637X/768/1/25, 25, Bibcode: 2013ApJ...768...25G. 
  14. ↑ Van Belle, Gerard T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V. 



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