Astronomy: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 |
| Distance | 300 ± 4 ly (92 ± 1 pc) |
| Absolute magnitude (MV) | +0.24[5] |
| Details | |
| Mass | 2.73[6] M☉ |
| Radius | 3.2[7] R☉ |
| Luminosity | 107[5] L☉ |
| Surface gravity (log g) | 4.01±0.14[6] cgs |
| Temperature | 11,381±387[6] K |
| Rotation | 1.40032[8] d |
| Rotational velocity (v sin i) | 98[6] km/s |
| Age | 118[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ↑ 1.0 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.
- ↑ 2.0 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, Bibcode: 1973MNSSA..32...11C.
- ↑ 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, Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W.
- ↑ 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, Bibcode: 2012AstL...38..331A.
- ↑ 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, Bibcode: 2015ApJ...804..146D.
- ↑ 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.
- ↑ 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, Bibcode: 2022ApJ...924..117B.
- ↑ "nu. Dor". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=nu.+Dor.
- ↑ 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, Bibcode: 2008MNRAS.389..869E.
- ↑ 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.
- ↑ 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, Bibcode: 2006ApJ...653..675S.
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