Astronomy:64 Eridani

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Short description: Single, yellow-white hued star in the constellation Eridanus
64 Eridani
Location of 64 Eridani (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Eridanus[1]
Right ascension  04h 59m 55.73680s[2]
Declination −12° 32′ 14.7004″[2]
Apparent magnitude (V) 4.77 – 4.79[3]
Characteristics
Evolutionary stage subgiant[4]
Spectral type F0 V[5]
B−V color index 0.266[6]
Variable type δ Sct[7][3]
Astrometry
Radial velocity (Rv)−8.9±4.2[8] km/s
Proper motion (μ) RA: +39.894[2] mas/yr
Dec.: −87.358[2] mas/yr
Parallax (π)11.5441 ± 0.0851[2] mas
Distance283 ± 2 ly
(86.6 ± 0.6 pc)
Absolute magnitude (MV)+0.03[1]
Details
Mass2.33[9] M☉
Radius5.22[10] R☉
Luminosity65[10] L☉
Surface gravity (log g)3.37[9] cgs
Temperature7,346±250[9] K
Rotational velocity (v sin i)212[11] km/s
Age756[9] Myr
Other designations
64 Eri, S Eri, BD−12°1047, HD 32045, HIP 23231, HR 1611, SAO 150064[12]
Database references
SIMBADdata

64 Eridani is a single,[13] 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 4.8.[6] The annual parallax shift is measured at 12.01 mas, which equates to a distance of about 283 light years.[2] In addition to its proper motion, it is moving closer to the Sun with a radial velocity of around −9 km/s.[8]

A light curve for S Eridani, adapted from Koen and Eyer (2002)[14]

This is an F-type star with a stellar classification of F0 V.[5] It is catalogued a low amplitude Delta Scuti variable with a primary period of 0.273 days.[7] It was originally classified, tentatively, as an RR Lyrae variable of type 'c'.[15]

64 Eridani is spinning rapidly with a projected rotational velocity of 212 km/s.[11] This is giving the star an oblate shape with an equatorial bulge; its equatorial radius is 8% larger than its polar radius.[16] The star is an estimated 756 million years old with 2.3 times the mass of the Sun.[9] It is radiating 65 times the Sun's luminosity[10] from its photosphere at an effective temperature of roughly 7,346 K.[9]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 "S Eri". AAVSO. https://vsx.aavso.org/index.php?view=detail.top&oid=13983. 
  4. ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 Høg, E. et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics 355: L27, doi:10.1888/0333750888/2862, Bibcode: 2000A&A...355L..27H. 
  7. ↑ 7.0 7.1 Rodríguez, E.; Breger, M. (January 2001), "delta Scuti and related stars: Analysis of the R00 Catalogue", Astronomy and Astrophysics 366: 178–196, doi:10.1051/0004-6361:20000205, Bibcode: 2001A&A...366..178R. 
  8. ↑ 8.0 8.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 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, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D. 
  10. ↑ 10.0 10.1 10.2 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series 268 (1): 4. doi:10.3847/1538-4365/acdee5. Bibcode: 2023ApJS..268....4F. 
  11. ↑ 11.0 11.1 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. 
  12. ↑ "64 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=64+Eri. 
  13. ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  14. ↑ 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. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K. 
  15. ↑ Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S, http://www.sai.msu.su/gcvs/gcvs/, retrieved 2019-08-06. 
  16. ↑ Belle, G. 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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