Nu Arietis

Nu Arietis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Aries
Right ascension	02^h 38^m 48.99425^s[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 mas[1]
Distance	340 ± 30 ly (103 ± 8 pc)
Absolute magnitude (MV)	+0.40[5]
Details
ν Ari A
Mass	2.43±0.06[6] M☉
Radius	1.8[7] R☉
Luminosity	63.5[6] L☉
Surface gravity (log g)	3.5±0.25[8] cgs
Temperature	8,000±500[8] K
Rotational velocity (v sin i)	133[6] km/s
Age	621+269 −268[8] Myr
ν Ari B
Mass	1.0±0.03[8] M☉
Temperature	5,551±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
SIMBAD	data

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. 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. 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. 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.
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, S2CID 59451347, 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, S2CID 119257644.
6. 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.
7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 5211–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
8. Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 13, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065, 40.
9. "nu. Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.

External links

• Aladin previewer
• Aladin sky atlas
• HR 773