64 Eridani
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 59m 55.73677s[1] |
| Declination | −12° 32′ 14.6983″[1] |
| Apparent magnitude (V) | 4.77[2] |
| Characteristics | |
| Spectral type | F0 V[3] |
| B−V color index | 0.266[2] |
| Variable type | δ Sct[4] |
| Astrometry | |
| Radial velocity (Rv) | −8.9±4.2[5] km/s |
| Proper motion (μ) | RA: +39.67[1] mas/yr Dec.: −87.04[1] mas/yr |
| Parallax (π) | 11.24 ± 0.23[1] mas |
| Distance | 290 ± 6 ly (89 ± 2 pc) |
| Absolute magnitude (MV) | 0.03[6] |
| Details | |
| Mass | 1.52[7] M☉ |
| Luminosity | 80.17[6] L☉ |
| Surface gravity (log g) | 3.37[7] cgs |
| Temperature | 7,346±250[7] K |
| Rotational velocity (v sin i) | 212[8] km/s |
| Age | 644[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
64 Eridani is a single,[10] yellow-white hued star in the constellation Eridanus with the variable star designation S Eridani. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.77.[2] The annual parallax shift is measured at 11.24 mas, which provides a distance estimate of about 290 light years.[1] It is moving closer to the Sun with a radial velocity of around −9 km/s.[5]
This is an F-type main-sequence star with a stellar classification of F0 V.[3] It is catalogued a low amplitude Delta Scuti variable with a primary period of 0.273 days.[4] Alternatively, it may be an RR Lyrae variable of type 'c'.[11] 64 Eridani is spinning rapidly with a projected rotational velocity of 212 km/s.[8] This is giving the star an oblate shape with an equatorial bulge that is 8% larger than the polar radius.[12] The star is an estimated 644 million years old with 1.5 times the mass of the Sun.[7] It is radiating 80[6] times the Sun's luminosity from its photosphere at an effective temperature of roughly 7,346 K.[7]
References
- 1 2 3 4 5 6 van Leeuwen, F. (November 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 Høg, E.; et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
- 1 2 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- 1 2 Rodríguez, E.; Breger, M. (January 2001), "delta Scuti and related stars: Analysis of the R00 Catalogue", Astronomy and Astrophysics, 366: 178–196, Bibcode:2001A&A...366..178R, doi:10.1051/0004-6361:20000205.
- 1 2 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
- 1 2 3 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.
- 1 2 3 4 5 6 David, Trevor J.; Hillenbrand, Lynne A. (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): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
- 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.
- ↑ "64 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-29.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
- ↑ Gavrilchenko, Tatyana; et al. (June 2014), "A mid-infrared study of RR Lyrae stars with the Wide-field Infrared Survey Explorer all-sky data release", Monthly Notices of the Royal Astronomical Society, 441 (1): 715−725, arXiv:1312.4643, Bibcode:2014MNRAS.441..715G, doi:10.1093/mnras/stu606.
- ↑ Belle, G. T. (2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20: 51. arXiv:1204.2572. Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2.