Astronomy:Xi Eridani

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Short description: Star in the constellation Eridanus
ξ Eridani
Location of ξ Eridani (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Eridanus
Right ascension  04h 23m 40.85270s[1]
Declination −03° 44′ 43.6771″[1]
Apparent magnitude (V) 5.17[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A2 V[4]
U−B color index +0.08[2]
B−V color index +0.08[2]
Astrometry
Radial velocity (Rv)−11.0[5] km/s
Proper motion (μ) RA: −47.36[1] mas/yr
Dec.: −54.91[1] mas/yr
Parallax (π)15.60 ± 0.25[1] mas
Distance209 ± 3 ly
(64 ± 1 pc)
Absolute magnitude (MV)+1.59[6]
Details
Mass2.29[7] M☉
Radius2.2[8] R☉
Luminosity27.6[9] L☉
Surface gravity (log g)3.73[10] cgs
Temperature8,400[9] K
Rotational velocity (v sin i)194.3±2.3[4] km/s
Age450[7] Myr
Other designations
ξ Eri, BD−04°818, 42 Eridani, FK5 1120, HD 27861, HIP 20507, HR 1383, SAO 131176[11]
Database references
SIMBADdata

ξ Eridani (Latinised as Xi Eridani) is a solitary[7] star in the constellation Eridanus. With an apparent visual magnitude of 5.17,[2] it is faintly visible to the naked eye on a clear, dark night. Based upon an annual parallax shift of 0.00156 arcseconds,[1] it is located around 209 light years from the Sun. The star is considered a member of the Sirius supercluster.[6]

This is an ordinary A-type main sequence star with a stellar classification of A2 V,[4] indicating that it is generating energy through the thermonuclear fusion of hydrogen into helium in its core region. It is around 450[7] million years old and has a relatively high rate of rotation with a projected rotational velocity of 194 km/s.[4] The star has about 2.3 times the mass of the Sun,[7] 2.2 times the Sun's radius,[8] and radiates 27.6[9] times the solar luminosity from its outer atmosphere at an effective temperature of 8,400 K.[9]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", SIMBAD, Bibcode: 1986EgUBV........0M. 
  3. ↑ 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. 
  4. ↑ 4.0 4.1 4.2 4.3 Díaz, C. G. et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics 531: A143, doi:10.1051/0004-6361/201016386, Bibcode: 2011A&A...531A.143D. 
  5. ↑ Wielen, R. et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg (Veröffentlichungen des Astronomisches Rechen-Institut Heidelberg) 35: 1, Bibcode: 1999VeARI..35....1W. 
  6. ↑ 6.0 6.1 Eggen, Olin J. (August 1998), "The Sirius Supercluster and Missing Mass near the Sun", The Astronomical Journal 116 (2): 782–788, doi:10.1086/300465, Bibcode: 1998AJ....116..782E. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 De Rosa, R. J. et al. (January 2014), "The VAST Survey – III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society 437 (2): 1216–1240, doi:10.1093/mnras/stt1932, Bibcode: 2014MNRAS.437.1216D. 
  8. ↑ 8.0 8.1 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, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  9. ↑ 9.0 9.1 9.2 9.3 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M. 
  10. ↑ King, Jeremy R. et al. (April 2003), "Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group", The Astronomical Journal 125 (4): 1980–2017, doi:10.1086/368241, Bibcode: 2003AJ....125.1980K, https://tigerprints.clemson.edu/cgi/viewcontent.cgi?article=1248&context=physastro_pubs. 
  11. ↑ "* ksi Eri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+ksi+Eri. 



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