Astronomy:Xi1 Centauri

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Short description: Star in the constellation Centaurus


ξ1 Centauri
Location of ξ1 Centauri (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Centaurus
Right ascension  13h 03m 33.30528s[1]
Declination −49° 31′ 38.1518″[1]
Apparent magnitude (V) +4.83[2]
Characteristics
Spectral type A0 V[3]
U−B color index +0.014[2]
B−V color index +0.030[2]
Astrometry
Radial velocity (Rv)0.00±3.70[4] km/s
Proper motion (μ) RA: −47.55[1] mas/yr
Dec.: −11.52[1] mas/yr
Parallax (π)14.79 ± 0.27[1] mas
Distance221 ± 4 ly
(68 ± 1 pc)
Absolute magnitude (MV)+0.68[5]
Details[6]
Mass2.39 M☉
Radius2.7[7] R☉
Luminosity43.2[8] L☉
Surface gravity (log g)4.11±0.14 cgs
Temperature10,462±356 K
Rotational velocity (v sin i)185[9] km/s
Age125 Myr
Other designations
ξ1 Cen, CD−48° 7887, HD 113314, HIP 63724, HR 4933, SAO 223870.[10]
Database references
SIMBADdata
ξ1 Cen is the brightest star in the picture, at the right of the galaxy NGC 4945.

Xi1 Centauri, Latinized from ξ1 Centauri, is a solitary[11] star in the southern constellation of Centaurus. It is visible to the naked eye with an apparent visual magnitude of +4.83.[2] With an annual parallax shift of 14.79 mas,[1] it is located around 221 light years from the Sun. At that distance, the apparent visual magnitude of the star is diminished by an interstellar extinction factor of 0.10[12] due to intervening dust. Just 17 arc minutes to the east of Xi1 Centauri lies the galaxy NGC 4945.[13]

This is an A-type main sequence star with a stellar classification of A0 V.[3] It is about 125 million years old[6] with a relatively high rate of spin, having a projected rotational velocity of 185 km/s.[9] The star has an estimated 2.4 times the mass of the Sun[6] and about 2.7 times the Sun's radius.[7] It is radiating 43 times the solar luminosity[8] from its outer atmosphere at an effective temperature of 10,462 K.[6]

See also

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 Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement 15: 459, doi:10.1086/190168, Bibcode: 1968ApJS...15..459G. 
  3. ↑ 3.0 3.1 Bauwens, E. K. J. et al. (2010), "Candidate Calibrators for the In-Orbit Spectrophotometric Calibration of the MIRI Medium Resolution Spectrograph Onboard the James Webb Space Telescope", in Deustua, Susana; Oliveira, Cristina, The 2010 STScI Calibration Workshop, Space Telescope Science Institute, http://www.stsci.edu/~INS/2010CalWorkshop/bauwens.pdf, retrieved 2016-01-10. 
  4. ↑ 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. 
  5. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 6.2 6.3 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. 
  7. ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  8. ↑ 8.0 8.1 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. 
  9. ↑ 9.0 9.1 Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), Bibcode: 1970crvs.book.....U. 
  10. ↑ "ksi01 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ksi01+Cen. 
  11. ↑ 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. 
  12. ↑ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G. 
  13. ↑ O'Meara, Stephen James (2016), Deep-Sky Companions: The Caldwell Objects (2nd ed.), Cambridge University Press, p. 392, ISBN 978-1316033531, https://books.google.com/books?id=evkODQAAQBAJ&pg=PA392. 



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