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Nu2 Coronae Borealis is a solitary,[11] orange-hued star located in the northern constellation of Corona Borealis. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.4.[2] Based upon an annual parallax shift of 5.49 mas,[1] it is located roughly 590 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.1 due to interstellar dust.[12]

For other stars with this Bayer designation, see ν Coronae Borealis.
Nu2 Coronae Borealis

ν2 Coronae Borealis (lower red star) in optical light
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 16h 22m 29.21855s[1]
Declination +33° 42′ 12.5274″[1]
Apparent magnitude (V) +5.396[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.787[2]
B−V color index +1.525[2]
Astrometry
Radial velocity (Rv)−41.1±0.2[4] km/s
Proper motion (μ) RA: −5.42[1] mas/yr
Dec.: +50.56[1] mas/yr
Parallax (π)5.49 ± 0.24 mas[1]
Distance590 ± 30 ly
(182 ± 8 pc)
Absolute magnitude (MV)−0.78[5]
Details
Radius50[6] R☉
Luminosity530[7] L☉
Surface gravity (log g)1.76[8] cgs
Temperature3,940[8] K
Metallicity [Fe/H]−0.16[8] dex
Rotational velocity (v sin i)3.1[9] km/s
Other designations
ν2 Coronae Borealis, 21 CrB, BD+34 2774, HD 147767, HIP 80214, HR 6108, SAO 65259[10]
Database references
SIMBADdata

This is an evolved red giant star with a stellar classification of K5 III.[3] The measured angular diameter of Nu2 Coronae Borealis is 2.53±0.16 mas.[13] At its estimated distance, this yields a physical size of about 50 times the radius of the Sun.[6] Nu2 Coronae Borealis is radiating 530[7] times the Sun's luminosity from its photosphere at an effective temperature of 3,940 K.[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. Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society, 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  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. Huang, W.; et al. (2012), "A catalogue of Paschen-line profiles in standard stars", Astronomy & Astrophysics, 547: A62, arXiv:1210.7893, Bibcode:2012A&A...547A..62H, doi:10.1051/0004-6361/201219804, S2CID 119286159.
  6. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  7. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  8. McWilliam, Andrew (1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", The Astrophysical Journal Supplement Series, 74: 1075, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
  9. De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
  10. "nu02 CrB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-25.{{cite web}}: CS1 maint: postscript (link)
  11. 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.
  12. Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
  13. Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.

На других языках

- [en] Nu2 Coronae Borealis

[es] Ni2 Coronae Borealis

Ni2 Coronae Borealis (ν2 CrB / 21 Coronae Borealis / HD 147767)[1] es una estrella en la constelación de Corona Borealis de magnitud aparente +5,40. Forma una doble óptica con ν1 Coronae Borealis, compartiendo con ella la denominación de Bayer «Ni». Aunque ambas estrellas están separadas apenas unos 10 años luz (una distancia que puede variar debido a errores de medición), los distintos movimientos propios y velocidades radiales indican que simplemente están pasando una cerca de la otra. La edad de ambas es muy similar, unos 750 millones de años, y el menor brillo de Ni2 se debe a que es unos pocos millones de años más joven que Ni1.[2]


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