Astronomy:14 Eridani
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 16m 35.75439s[1] |
| Declination | −09° 09′ 16.3318″[1] |
| Apparent magnitude (V) | 6.143[2] |
| Characteristics | |
| Spectral type | F5 V Fe−0.7 CH−0.5[3] |
| B−V color index | 0.399[2] |
| Astrometry | |
| Radial velocity (Rv) | −5.3±2.9[4] km/s |
| Proper motion (μ) | RA: +8.057[1] mas/yr Dec.: +22.871[1] mas/yr |
| Parallax (π) | 26.9856 ± 0.2356[1] mas |
| Distance | 121 ± 1 ly (37.1 ± 0.3 pc) |
| Absolute magnitude (MV) | 3.47[5] |
| Details | |
| Mass | 1.31[6] M☉ |
| Radius | 1.48+0.9 −0.8[1] R☉ |
| Luminosity | 3.87±0.04[1] L☉ |
| Surface gravity (log g) | 4.34±0.14[6] cgs |
| Temperature | 6,719±228[6] K |
| Metallicity [Fe/H] | −0.10[7] dex |
| Age | 1.391[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
14 Eridani is a star in the equatorial Eridanus constellation. It has an apparent visual magnitude of 6.143[2] and is moving closer to the Sun with a radial velocity of around −5 km/s.[4] The measured annual parallax shift is 29.26 mas,[1] which provides an estimated distance of about 121 light years. Proper motion studies indicate that this is an astrometric binary.[9][10]
The visible component has a stellar classification of F5 V Fe−0.7 CH−0.5,[3] which indicates it has the spectrum of an F-type main-sequence star with mild underabundances of iron and methylidyne. It is 1.4[6] billion years old with 1.3[6] times the mass of the Sun and 1.5[1] times the Sun's radius. The star is radiating 3.87[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,719 K.[6] The system has been detected as a source of X-ray emission.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Høg, E. et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics 355: L27, doi:10.1888/0333750888/2862, Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 Gray, R. O. et al. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 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.
- ↑ 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 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.
- ↑ Casagrande, L. et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics 530: A138, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C.
- ↑ "14 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=14+Eri.
- ↑ Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal 129 (5): 2420–2427, doi:10.1086/429590, Bibcode: 2005AJ....129.2420M.
- ↑ Frankowski, A. et al. (March 2007), "Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data", Astronomy and Astrophysics 464 (1): 377–392, doi:10.1051/0004-6361:20065526, Bibcode: 2007A&A...464..377F.
- ↑ Huensch, M. et al. (October 1998), "The ROSAT all-sky survey catalogue of optically bright main-sequence stars and subgiant stars", Astronomy and Astrophysics Supplement 132 (2): 155−171, doi:10.1051/aas:1998287, Bibcode: 1998A&AS..132..155H.
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