14 Eridani

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]

14 Eridani
Observation data
Epoch J2000      Equinox
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
Distance121 ± 1 ly
(37.1 ± 0.3 pc)
Absolute magnitude (MV)3.47[5]
Details
Mass1.31[6] M☉
Radius1.48+0.9
−0.8[1] R☉
Luminosity3.87±0.04[1] L☉
Surface gravity (log g)4.34±0.14[6] cgs
Temperature6,719±228[6] K
Metallicity [Fe/H]−0.10[7] dex
Age1.391[6] Gyr
Other designations
14 Eri, BD−09° 627, GC 3918, HD 20395, HIP 15244, HR 988, SAO 130395, PPM 185595, WDS J03158-0849B[8]
Database references
SIMBADdata

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. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Høg, E.; et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
  3. 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, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  4. 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  7. 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, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  8. "14 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-27.
  9. Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal, 129 (5): 2420–2427, Bibcode:2005AJ....129.2420M, doi:10.1086/429590.
  10. 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, arXiv:astro-ph/0612449, Bibcode:2007A&A...464..377F, doi:10.1051/0004-6361:20065526.
  11. 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, Bibcode:1998A&AS..132..155H, doi:10.1051/aas:1998287.
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