Astronomy:Nu Doradus

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Short description: Star in the constellation Dorado
Nu Doradus
Observation data
Equinox J2000.0]] (ICRS)
Constellation Dorado
Right ascension  06h 08m 44.26199s[1]
Declination −68° 50′ 36.2797″[1]
Apparent magnitude (V) 5.06[2]
Characteristics
Spectral type B8 V[3]
U−B color index −0.19[2]
B−V color index −0.08[2]
Astrometry
Radial velocity (Rv)+17.5[4] km/s
Proper motion (μ) RA: −50.84[1] mas/yr
Dec.: +19.01[1] mas/yr
Parallax (π)10.88 ± 0.13[1] mas
Distance300 ± 4 ly
(92 ± 1 pc)
Absolute magnitude (MV)+0.24[5]
Details
Mass2.73[6] M
Radius3.2[7] R
Luminosity107[5] L
Surface gravity (log g)4.01±0.14[6] cgs
Temperature11,381±387[6] K
Rotation1.40032[8] d
Rotational velocity (v sin i)98[6] km/s
Age118[6] Myr
Other designations
ν Dor, CPD−68° 474, FK5 1166, HD 43107, HIP 29134, HR 2221, SAO 249461[9]
Database references
SIMBADdata

Nu Doradus, Latinized from ν Doradus, is a single,[10] blue-white hued star in the southern constellation of Dorado. It is visible to the naked eye with an apparent visual magnitude of +5.06.[2] Based upon an annual parallax shift of 10.88 mas as seen from Earth,[1] it is located about 300 light years from the Sun.[11] At that distance, the visual magnitude is diminished by an extinction of 0.07 due to interstellar dust. It is moving further from the Sun with a heliocentric radial velocity of +17.5 km/s.[4]

This is an ordinary B-type main-sequence star, as indicated by its stellar classification of B8 V.[3] It is an estimated 118[6] million years old and is spinning with a projected rotational velocity of 98 km/s.[6] The star has 2.7[6] times the mass of the Sun and about 3.2[7] times the Sun's radius. It is radiating 107[5] times the Sun's luminosity from its photoshere at an effective temperature of 11,381 K.[6] No infrared excess has been detected.[12]

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, Bibcode2007A&A...474..653V. 
  2. 2.0 2.1 2.2 2.3 Cousins, A. W. J. (1973), "UBV photometry of some southern stars", Monthly Notes of the Astronomical Society of Southern Africa 32: 11, Bibcode1973MNSSA..32...11C. 
  3. 3.0 3.1 Houk, Nancy (1975), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode1978mcts.book.....H. 
  4. 4.0 4.1 Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institution of Washington), Bibcode1953GCRV..C......0W. 
  5. 5.0 5.1 5.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  6. 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 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, Bibcode2015ApJ...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, Bibcode2001A&A...367..521P. 
  8. Barraza, L. F.; Gomes, R. L.; Messias, Y. S.; Leão, I. C.; Almeida, L. A.; Janot-Pacheco, E.; Brito, A. C.; Brito, F. A. C. et al. (2022), "Rotation Signature of TESS B-type Stars. A Comprehensive Analysis", The Astrophysical Journal 924 (2): 117, doi:10.3847/1538-4357/ac3335, Bibcode2022ApJ...924..117B. 
  9. "nu. Dor". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=nu.+Dor. 
  10. Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode2008MNRAS.389..869E. 
  11. Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694−706, doi:10.1134/S1063773712110035, Bibcode2012AstL...38..694G. 
  12. Su, K. Y. L. et al. (December 2006), "Debris Disk Evolution around A Stars", The Astrophysical Journal 653 (1): 675−689, doi:10.1086/508649, Bibcode2006ApJ...653..675S.