Astronomy:Nu Arietis

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Short description: Star in the constellation Aries
Nu Arietis
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aries
Right ascension  02h 38m 48.99425s[1]
Declination +21° 57′ 41.0616″[1]
Apparent magnitude (V) 5.43[2]
Characteristics
Spectral type A7 V[3]
U−B color index +0.13[2]
B−V color index +0.16[2]
Astrometry
Radial velocity (Rv)+8.0±4.2[4] km/s
Proper motion (μ) RA: −7.47[1] mas/yr
Dec.: −15.90[1] mas/yr
Parallax (π)9.68 ± 0.76[1] mas
Distance340 ± 30 ly
(103 ± 8 pc)
Absolute magnitude (MV)+0.40[5]
Details
ν Ari A
Mass2.43±0.06[6] M☉
Radius1.8[7] R☉
Luminosity63.5[6] L☉
Surface gravity (log g)3.5±0.25[8] cgs
Temperature8,000±500[8] K
Rotational velocity (v sin i)133[6] km/s
Age621+269
−268[8] Myr
ν Ari B
Mass1.0±0.03[8] M☉
Temperature5,551±107[8] K
Metallicity [Fe/H]0.0[8] dex
Rotational velocity (v sin i)10[8] km/s
Other designations
ν Ari, 32 Arietis, BD+21° 362, FK5 89, HD 16432, HIP 12332, HR 773, SAO 75495[9]
Database references
SIMBADdata

Nu Arietis, Latinized from ν Arietis, is the Bayer designation for a white-hued star in the northern constellation of Aries. It is faintly visible to the naked eye with an apparent visual magnitude of +5.43.[2] Based upon an annual parallax shift of 9.68 mas as seen from Earth,[1] it is located roughly 340 light years from the Sun. It is moving away from the Sun with a radial velocity of 8 km/s.[4]

This is an A-type main sequence star with a stellar classification of A7 V.[3] Nu Arietis has an estimated 2.4[6] times the mass of the Sun and about 1.8[7] times the Sun's radius. The star is radiating 63.5[6] times the Sun's luminosity from its photosphere at an effective temperature of around 8,000 K.[8] It is roughly 621[8] million years old and is spinning with a projected rotational velocity of 133 km/s.[6] A close companion was discovered in 2016 using the direct spectral detection method.[8]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 Oja, T. (April 1983), "UVB photometry of FK4 and FK4 Supplement stars", Astronomy and Astrophysics Supplement Series 52: 131–134, Bibcode: 1983A&AS...52..131O. 
  3. ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C. 
  4. ↑ 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. 
  5. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Huang, Wenjin et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal 722 (1): 605–619, doi:10.1088/0004-637X/722/1/605, Bibcode: 2010ApJ...722..605H. 
  7. ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 5211–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 Gullikson, Kevin et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal 152 (2): 13, doi:10.3847/0004-6256/152/2/40, 40, Bibcode: 2016AJ....152...40G. 
  9. ↑ "nu. Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=nu.+Ari. 

External links



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