Astronomy:Psi Eridani
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Short description: Star in the constellation Eridanus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 05h 01m 26.34599s[1] |
| Declination | −07° 10′ 26.2662″[1] |
| Apparent magnitude (V) | 4.81[2] |
| Characteristics | |
| Spectral type | B3 V[3] or B3 IV[4] |
| U−B color index | −0.75[2] |
| B−V color index | −0.19[2] |
| Astrometry | |
| Radial velocity (Rv) | 20.7±1.1[5] km/s |
| Proper motion (μ) | RA: +1.71[1] mas/yr Dec.: +6.29[1] mas/yr |
| Parallax (π) | 4.41 ± 0.23[1] mas |
| Distance | 740 ± 40 ly (230 ± 10 pc) |
| Absolute magnitude (MV) | −1.97[6] |
| Details | |
| Mass | 7.00±0.43[7] M☉ |
| Radius | 4.5[8] R☉ |
| Luminosity | 2,878[7] L☉ |
| Surface gravity (log g) | 3.859±0.025[9] cgs |
| Temperature | 18,700[7] K |
| Rotational velocity (v sin i) | 52±8[3] km/s |
| Age | 31.6±0.6[10] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Psi Eridani, Latinized from ψ Eridani, is a star in the constellation Eridanus. With an apparent visual magnitude is 4.81,[2] it can be seen with the naked eye on a clear, dark night. Based upon an annual parallax shift of 4.41 milliarcseconds,[1] it is located roughly 740 light-years away from the Sun.
This is a B-type main-sequence star with a stellar classification of B3 V.[3] However, Houk and Swift (1999) classed it as a more evolved subgiant star. It is about 32[10] million years old and has a projected rotational velocity of 52 km/s.[3] The estimated mass is seven times that of the Sun,[7] and it has around 4.5 times the Sun's radius.[8] Psi Eridani shines with 2,878[7] times the solar luminosity from its outer atmosphere at an effective temperature of 18,700 K.[7]
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 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 3.2 3.3 Bragança, G. A. et al. (November 2012), "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk", The Astronomical Journal 144 (5): 10, doi:10.1088/0004-6256/144/5/130, 130, Bibcode: 2012AJ....144..130B.
- ↑ Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey 05, Bibcode: 1999MSS...C05....0H.
- ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Hohle, M. M. et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349–360, doi:10.1002/asna.200911355, Bibcode: 2010AN....331..349H.
- ↑ 8.0 8.1 Pasinetti Fracassini, L. E. et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics 367 (2): 521–24, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ Huang, Wenjin et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal 722 (1): 605–619, doi:10.1088/0004-637X/722/1/605, Bibcode: 2010ApJ...722..605H.
- ↑ 10.0 10.1 Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T
- ↑ "psi Eri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=psi+Eri.
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