Psi Eridani
| Observation data Epoch J2000.0 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 mas[1] |
| Distance | 740 ± 40 ly (230 ± 10 pc) |
| Details | |
| Mass | 7.00±0.43[6] M☉ |
| Radius | 4.5[7] R☉ |
| Luminosity | 2,878[6] L☉ |
| Surface gravity (log g) | 3.859±0.025[8] cgs |
| Temperature | 18,700[6] K |
| Rotational velocity (v sin i) | 52±8[3] km/s |
| Age | 31.6±0.6[9] Myr |
| Other designations | |
Psi Eridani (ψ Eri) 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[9] million years old and has a projected rotational velocity of 52 km/s.[3] The estimated mass is seven times that of the Sun,[6] and it has around 4.5 times the Sun's radius.[7] Psi Eridani shines with 2,878[6] times the solar luminosity from its outer atmosphere at an effective temperature of 18,700 K.[6]
References
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
- ^ a b c d 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, Bibcode:2012AJ....144..130B, doi:10.1088/0004-6256/144/5/130, 130.
- ^ 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, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
- ^ a b c d e f Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355.
- ^ a b 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: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
- ^ Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605−619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605.
- ^ a b 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x
{{citation}}: CS1 maint: unflagged free DOI (link) - ^ "psi Eri -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-11-03.
