| 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 mas [1] |
| 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
- ^ a b c d e f 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, S2CID 18759600.
- ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
- ^ a b c 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, S2CID 119476992.
- ^ 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, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e f g 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, S2CID 33401607, 146.
- ^ a b 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, S2CID 425754.
- ^ 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, S2CID 118665352.
- ^ a b 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, S2CID 18475298.
-
^
"tau03 Eri".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2016-10-13.
{{ cite web}}: CS1 maint: postscript ( link) - ^ 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, S2CID 18154947.
- ^ 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, S2CID 119295265, 25.
- ^ Van Belle, Gerard T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv: 1204.2572, Bibcode: 2012A&ARv..20...51V, doi: 10.1007/s00159-012-0051-2, S2CID 119273474.
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| 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 mas [1] |
| 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
- ^ a b c d e f 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, S2CID 18759600.
- ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
- ^ a b c 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, S2CID 119476992.
- ^ 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, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e f g 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, S2CID 33401607, 146.
- ^ a b 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, S2CID 425754.
- ^ 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, S2CID 118665352.
- ^ a b 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, S2CID 18475298.
-
^
"tau03 Eri".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2016-10-13.
{{ cite web}}: CS1 maint: postscript ( link) - ^ 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, S2CID 18154947.
- ^ 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, S2CID 119295265, 25.
- ^ Van Belle, Gerard T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv: 1204.2572, Bibcode: 2012A&ARv..20...51V, doi: 10.1007/s00159-012-0051-2, S2CID 119273474.
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| Nebulae |
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| Galaxies |
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