17 Eridani

Last updated
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  mas [1]
Distance 400 ± 10  ly
(124 ± 3  pc)
Absolute magnitude  (MV)−0.72 [2]
Details
Mass 3.55±0.04 [3]   M☉
Radius 3.2 [6]   R☉
Luminosity 267.9+15.2
−14.4 [3]   L☉
Surface gravity (log g)3.603±0.017 [7]   cgs
Temperature 11,143±51 [3]   K
Rotational velocity (v sin i)86 [3]  km/s
Age 178+10
−9 [8]   Myr
Other designations
v Eri, 17 Eri, BD−05°674, HD 21790, HIP 16341, HR 1070, SAO 130528 [9]
Database references
SIMBAD data

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]

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 the star is still generating energy through hydrogen fusion at its core, although nearing the end of its main sequence life. [3] 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. 1 2 3 4 5 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, S2CID   18759600.
  2. 1 2 3 4 5 6 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, S2CID   119257644.
  3. 1 2 3 4 5 6 7 8 9 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, S2CID   55586789.
  4. 1 2 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. 1 2 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. 1 2 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv: astro-ph/0012289 , Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID   425754.
  7. 1 2 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, S2CID   118532653.
  8. 1 2 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, S2CID   17507782.
  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 , S2CID   14878976.
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