Tau3 Eridani
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| 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) |
| Details | |
| Mass | 1.78[5] M☉ |
| Radius | 1.9[6] R☉ |
| Luminosity | 13.7[7] L☉ |
| Surface gravity (log g) | 4.17[5] cgs |
| Temperature | 8,251±281[5] K |
| Metallicity [Fe/H] | −0.21[3] dex |
| Rotational velocity (v sin i) | 133[8] km/s |
| Age | 476[5] Myr |
| Other designations | |
Tau3 Eridani (τ3 Eri) 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.[10] However, this has not been confirmed.[11]
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[5] million years old and is spinning rapidly with a projected rotational velocity of 133 km/s.[8] This is creating an equatorial bulge that is 7% wider than the polar radius.[12] Tau3 Eridani has 178%[5] of the Sun's mass and nearly double the radius of the Sun.[6] The star shines with 13.7 times the solar luminosity from an outer atmosphere at an effective temperature of 8,251 K.[5]
References
- 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752
, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. - 1 2 3 4 Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode:1986EgUBV........0M.
- 1 2 3 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.
- ↑ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
- 1 2 3 4 5 6 7 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, 146.
- 1 2 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, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
- ↑ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
- 1 2 Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
- ↑ "tau03 Eri -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-10-13.
- ↑ Song, Inseok; et al. (January 2001), "Ages of A-Type Vega-like Stars from uvbyβ Photometry", The Astrophysical Journal, 546 (1): 352−357, arXiv:astro-ph/0010102, Bibcode:2001ApJ...546..352S, doi:10.1086/318269.
- ↑ Gáspár, András; et al. (May 2013), "The Collisional Evolution of Debris Disks", The Astrophysical Journal, 768 (1): 29, arXiv:1211.1415, Bibcode:2013ApJ...768...25G, doi:10.1088/0004-637X/768/1/25, 25.
- ↑ Van Belle, Gerard T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20: 51, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2.