Astronomy:Tau3 Eridani
| 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 | |
| Spectral type | A3 IV-V[3] |
| U−B color index | +0.08[2] |
| B−V color index | +0.16[2] |
| Astrometry | |
| Radial velocity (Rv) | −9.8[4] 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 |
| Distance | 88.6 ± 0.4 ly (27.2 ± 0.1 pc) |
| Absolute magnitude (MV) | +1.91[5] |
| Details | |
| Mass | 1.78[6] M☉ |
| Radius | 1.9[7] R☉ |
| Luminosity | 13.7[8] L☉ |
| Surface gravity (log g) | 4.17[6] cgs |
| Temperature | 8,251±281[6] K |
| Metallicity [Fe/H] | −0.21[3] dex |
| Rotational velocity (v sin i) | 133[9] km/s |
| Age | 476[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[11] However, this has not been confirmed.[12]
This is an A-type star with a stellar classification of A3 IV-V.[3] The luminosity class of IV-V indicates the spectrum displays traits intermediate between a main sequence and subgiant star. It is around 476[6] million years old and is spinning rapidly with a projected rotational velocity of 133 km/s.[9] This is creating an equatorial bulge that might be 7% wider than the polar radius.[13] Tau3 Eridani has 178%[6] of the Sun's mass and nearly double the radius of the Sun.[7] The star shines with 13.7 times the solar luminosity from an outer atmosphere at an effective temperature of 8,251 K.[6]
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- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 3.2 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.
- ↑ 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.
- ↑ 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 6.3 6.4 6.5 6.6 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.
- ↑ 7.0 7.1 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.
- ↑ 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 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.
- ↑ "tau03 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tau03+Eri.
- ↑
- ↑ 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.
- ↑ 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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