Epsilon Doradus

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Epsilon Doradus
Diagram showing star positions and boundaries of the Dorado constellation and its surroundings
Cercle rouge 100%.svg

Location of ε Doradus (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Dorado
Right ascension 05h 49m 53.52107s[1]
Declination −66° 54′ 04.2787″[1]
Apparent magnitude (V) 5.11[2]
Characteristics
Spectral type B6 V[3]
U−B color index −0.49[2]
B−V color index −0.14[2]
Variable type SPB[4]
Astrometry
Radial velocity (Rv) +15.5±1.6[5] km/s
Proper motion (μ) RA: −21.81[1] mas/yr
Dec.: +37.55[1] mas/yr
Parallax (π) 5.68 ± 0.15[1] mas
Distance 570 ± 20 ly
(176 ± 5 pc)
Absolute magnitude (MV) −0.20[6]
Details
Mass 4.31±0.05[7] M
Radius 3.8±0.6[4] R
Luminosity 556[7] L
Surface gravity (log g) 3.89±0.20[4] cgs
Temperature 13,212[7] K
Rotational velocity (v sin i) 17[7] km/s
Other designations
ε Dor, CD−66° 351, HD 39844, HIP 27534, HR 2064, SAO 249368[8]
Database references
SIMBAD data

Epsilon Doradus (ε Dor) is a solitary[9] star located in the southern constellation of Dorado. It is visible to the naked eye with an apparent visual magnitude of 5.11.[2] Based upon an annual parallax shift of 5.68 mas as measured from Earth, it is located roughly 570 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.09 due to interstellar dust.[6]

This is a B-type main sequence star with a stellar classification of B6 V.[3] It is a slowly pulsating B-type star with a mean longitudinal magnetic field strength of −64±26 G.[4] With 4.31[7] times the mass of the Sun and 3.8[4] times the Sun's radius, it is about 85% of the way through its main sequence lifetime.[7] Epsilon Doradus radiates 556 times the solar luminosity from its photosphere at an effective temperature of 13,212 K.[7]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Johnson, H. L. (1966), "UBVRIJKL Photometry of the Bright Stars", Communications of the Lunar and Planetary Laboratory, 4, Bibcode:1966CoLPL...4...99J. 
  3. ^ a b Houk, Nancy (1979), 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. ^ a b c d e Hubrig, S.; et al. (April 2009), "New magnetic field measurements of β Cephei stars and slowly pulsating B stars", Astronomische Nachrichten, 330 (4): 317, Bibcode:2009AN....330..317H, arXiv:0902.1314Freely accessible, doi:10.1002/asna.200811187. 
  5. ^ 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, Bibcode:2012A&A...546A..61D, arXiv:1208.3048Freely accessible, doi:10.1051/0004-6361/201219219, A61. 
  6. ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694−706, Bibcode:2012AstL...38..694G, arXiv:1606.09028Freely accessible, doi:10.1134/S1063773712110035. 
  7. ^ a b c d e f g Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, Bibcode:2012A&A...537A.120Z, arXiv:1201.2052Freely accessible, doi:10.1051/0004-6361/201117691. 
  8. ^ "eps Dor -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-04-14. 
  9. ^ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.