17 Eridani

17 Eridani is a single[10] star in the equatorial constellation of Eridanus. It has the Bayer designation v Eridani, while 17 Eridani is the Flamsteed designation. This object is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.74.[2] It is moving further from the Earth with a heliocentric radial velocity of around +15 km/s.[2]

17 Eridani
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus
Right ascension  03h 30m 37.05823s[1]
Declination −05° 04′ 30.5239″[1]
Apparent magnitude (V) 4.74[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9 III[4] or B9Vs[5]
B−V color index −0.092±0.008[2]
Astrometry
Radial velocity (Rv)+15.0±4.2[2] km/s
Proper motion (μ) RA: 14.23[1] mas/yr
Dec.: 7.27[1] mas/yr
Parallax (π)8.07 ± 0.20[1] mas
Distance400 ± 10 ly
(124 ± 3 pc)
Absolute magnitude (MV)−0.72[2]
Details
Mass3.55±0.04[3] M☉
Radius3.2[6] R☉
Luminosity267.9+15.2
−14.4[3] L☉
Surface gravity (log g)3.603±0.017[7] cgs
Temperature11,143±51[3] K
Rotational velocity (v sin i)86[3] km/s
Age178+10
−9[8] Myr
Other designations
v Eri, 17 Eri, BD−05°674, HD 21790, HIP 16341, HR 1070, SAO 130528[9]
Database references
SIMBADdata

Houk and Swift (1999) found a stellar classification of B9 III[4] for this star, while Cowley et al. (1969) show B9 Vs.[5] Stellar models suggest this is a main sequence star,[3] which indicates it is generating energy through hydrogen fusion at its core. It is about 178[8] million years old with 3.55[3] times the mass of the Sun and around 3.2[6] times the size of the Sun. The star is radiating 268[3] times the Sun's luminosity from its photosphere at an effective temperature of 11,143 K.[3] These coordinates are a source for X-ray emission, which may be coming from an unresolved companion.[7]

References
  1. Van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 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.
  3. Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  4. Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  5. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  6. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  7. 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.
  8. Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics, 372: 152–164, arXiv:astro-ph/0103201, Bibcode:2001A&A...372..152H, doi:10.1051/0004-6361:20010452.
  9. "17 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-27.
  10. 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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