Summary
64 Eridani is a single,[12] yellow-white hued star in the constellation Eridanus having variable star designation S Eridani. It is faintly visible to the naked eye with an apparent visual magnitude of 4.77.[3] The annual parallax shift is measured at 12.01 mas, which equates to a distance of about 272 light years.[7] In addition to its proper motion, it is moving closer to the Sun with a radial velocity of around −9 km/s.[6]
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 59m 55.73677s[2] |
| Declination | −12° 32′ 14.6983″[2] |
| Apparent magnitude (V) | 4.77[3] |
| Characteristics | |
| Spectral type | F0 V[4] |
| B−V color index | 0.266[3] |
| Variable type | δ Sct[5] |
| Astrometry | |
| Radial velocity (Rv) | −8.9±4.2[6] km/s |
| Proper motion (μ) | RA: +39.67[2] mas/yr Dec.: −87.04[2] mas/yr |
| Parallax (π) | 12.0106 ± 0.2199 mas[7] |
| Distance | 272 ± 5 ly (83 ± 2 pc) |
| Absolute magnitude (MV) | 0.03[8] |
| Details | |
| Mass | 1.52[9] M☉ |
| Luminosity | 80.17[8] L☉ |
| Surface gravity (log g) | 3.37[9] cgs |
| Temperature | 7,346±250[9] K |
| Rotational velocity (v sin i) | 212[10] km/s |
| Age | 644[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an F-type main-sequence star with a stellar classification of F0 V.[4] It is catalogued a low amplitude Delta Scuti variable with a primary period of 0.273 days.[5] It was originally classified, tentatively, as an RR Lyrae variable of type 'c'.[13]
64 Eridani is spinning rapidly with a projected rotational velocity of 212 km/s.[10] This is giving the star an oblate shape with an equatorial bulge; its equatorial radius is 8% larger than its polar radius.[14] The star is an estimated 644 million years old with 1.5 times the mass of the Sun.[9] It is radiating 80[8] times the Sun's luminosity from its photosphere at an effective temperature of roughly 7,346 K.[9]
References edit
- ^ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.
- ^ a b c d 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, S2CID 18759600.
- ^ a b c 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.
- ^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- ^ a b 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.
- ^ a b 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, S2CID 59451347, A61.
- ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c 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 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, S2CID 33401607.
- ^ 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.
- ^ "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, S2CID 14878976.
- ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869, retrieved 2019-08-06.
- ^ Belle, G. 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.