Astronomy:Epsilon Doradus
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| Observation data 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 |
| Age | 210[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Doradus, Latinzied from ε Doradus, 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] The star is an estimated 210[6] million years old and is spinning with a projected rotational velocity of 17 km/s.[7] Epsilon Doradus radiates 556 times the solar luminosity from its photosphere at an effective temperature of 13,212 K.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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 Johnson, H. L. (1966), "UBVRIJKL Photometry of the Bright Stars", Communications of the Lunar and Planetary Laboratory 4: 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 4.2 4.3 4.4 Hubrig, S. et al. (April 2009), "New magnetic field measurements of β Cephei stars and slowly pulsating B stars", Astronomische Nachrichten 330 (4): 317, doi:10.1002/asna.200811187, Bibcode: 2009AN....330..317H.
- ↑ 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.
- ↑ 6.0 6.1 6.2 6.3 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.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ "eps Dor". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=eps+Dor.
- ↑ 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.
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