VZ Arietis

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VZ Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 48m 45.90719s[1]
Declination +25° 11′ 16.95410″[1]
Apparent magnitude (V) 5.89[2] (5.82 - 5.89)[3]
Spectral type A0 V[4]
B−V color index −0.033±0.005[2]
Variable type α2 CVn[3]
Radial velocity (Rv)+13.8±2.9[5] km/s
Proper motion (μ) RA: +56.600[1] mas/yr
Dec.: −0.264[1] mas/yr
Parallax (π)5.7743 ± 0.1298[1] mas
Distance560 ± 10 ly
(173 ± 4 pc)
Absolute magnitude (MV)0.48[2]
Mass2.74±0.09 M
Radius3.1[7] R
Surface gravity (log g)4.10[8] cgs
Metallicity [Fe/H]+0.1[8] dex
Rotational velocity (v sin i)54 km/s
Other designations
VZ Arietis, BD+24° 396, FK5 5868, HD 17471, HIP 13121, HR 830, SAO 75588[9]
Database references

VZ Arietis is single,[10] white-hued star in the northern zodiac constellation of Aries. Varying between magnitudes 5.82 and 5.89,[3] the star can be seen with the naked eye in dark, unpolluted areas. Based upon an annual parallax shift of 5.8 mas,[1] it is located 560 light years from the Sun. It is moving further away with a heliocentric radial velocity of +14 km/s.[5] The star was formerly known as 16 Trianguli, but as the star is no longer in the constellation Triangulum, this designation has fallen out of use.[11]

This is a chemically peculiar star[6] of type CP2 (Ap star),[12] showing an anomalous abundance of silicon in its spectrum.[13] It has a stellar classification of A0 V,[4] which indicates this is an A-type main-sequence star that currently fusing hydrogen into helium in its core. This is an Alpha2 Canum Venaticorum variable[12] with 2.7[6] times the mass of the Sun and about 3.1[7] times the Sun's radius. It is radiating 79 times the Sun's luminosity from its photosphere at an effective temperature of 10,304 K.[6]


  1. ^ a b c d e f 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:1804.09365Freely accessible. Bibcode:2018A&A...616A...1GFreely accessible. doi:10.1051/0004-6361/201833051Freely accessible. 
  2. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. 
  3. ^ a b c VSX (4 January 2010). "VZ Arietis". AAVSO Website. American Association of Variable Star Observers. Retrieved 15 June 2014. 
  4. ^ a b 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. 
  5. ^ a b 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:1208.3048Freely accessible. Bibcode:2012A&A...546A..61D. doi:10.1051/0004-6361/201219219. A61. 
  6. ^ a b c d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052Freely accessible. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. 
  7. ^ a b Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy & Astrophysics (Third ed.). 367 (2): 521–24. arXiv:astro-ph/0012289Freely accessible. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. 
  8. ^ a b Gebran, M.; et al. (2016). "A new method for the inversion of atmospheric parameters of A/Am stars". Astronomy & Astrophysics. 589: A83. arXiv:1603.01146Freely accessible. Bibcode:2016A&A...589A..83G. doi:10.1051/0004-6361/201528052. 
  9. ^ "HD 17471". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 22 August 2018. 
  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:0806.2878Freely accessible. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  11. ^ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy, Vol.18, NO. 3/AUG, P.209, 1987. 18: 222. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. 
  12. ^ a b Wraight, K. T.; et al. (February 2012). "A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 420 (1): 757–772. arXiv:1110.6283Freely accessible. Bibcode:2012MNRAS.420..757W. doi:10.1111/j.1365-2966.2011.20090.x. 
  13. ^ Zverko, J. (September 1984), "Classification of Ap-Stars HR 830 and 21 CVn", Bulletin of the Astronomical Institute of Czechoslovakia, 35: 294, Bibcode:1984BAICz..35..294Z