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Nu Geminorum, Latinized from ν Geminorum, is a triple[5] star system in the constellation Gemini. It has an apparent visual magnitude of 4.16,[2] which is bright enough to be visible to the naked eye on a dark night. Based upon an annual parallax shift of 5.99 mas,[1] it is located at a distance of roughly 540 light years from the Sun. The position of this system near the ecliptic means it is subject to lunar occultations.[9]

ν Geminorum

ν Geminorum in optical light
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Gemini
Right ascension 06h 28m 57.78613s[1]
Declination +20° 12′ 43.6856″[1]
Apparent magnitude (V) 4.16[2]
Characteristics
Spectral type B6 III + B8 III[3]
U−B color index −0.47[2]
B−V color index −0.13[2]
Astrometry
Radial velocity (Rv)+39.4[4] km/s
Proper motion (μ) RA: −6.82[1] mas/yr
Dec.: −13.10[1] mas/yr
Parallax (π)5.99 ± 0.28 mas[1]
Distance540 ± 30 ly
(167 ± 8 pc)
Absolute magnitude (MV)−2.2 + −1.2[3]
Orbit[5]
Primaryν Gem Aa
Companionν Gem Ab
Period (P)53.7722 ± 0.0008 d
Semi-major axis (a)2.82 ± 0.02 mas
Eccentricity (e)0.056 ± 0.003
Inclination (i)0.98 ± 0.03°
Longitude of the node (Ω)78.9 ± 0.2°
Periastron epoch (T)MJD 51011.8 ± 0.1
Argument of periastron (ω)
(secondary)		6.7 ± 2.0°
Semi-amplitude (K1)
(primary)		51.6 ± 0.6 km/s
Semi-amplitude (K2)
(secondary)		52.5 ± 1.1 km/s
Orbit[5]
Primaryν Gem A
Companionν Gem B
Period (P)6977.3 ± 6.1
Semi-major axis (a)82.8 ± 1.3 mas
Eccentricity (e)0.241 ± 0.002
Inclination (i)75.9 ± 0.2°
Longitude of the node (Ω)121.0 ± 0.1°
Periastron epoch (T)MJD 48810.3 ± 13.0
Argument of periastron (ω)
(secondary)		226.9 ± 0.4°
Semi-amplitude (K1)
(primary)		8.0 ± 0.1 km/s
Semi-amplitude (K2)
(secondary)		15.9 ± 0.1 km/s
Details
ν Gem Aa
Mass3.34[5] M☉
Luminosity1,380[6] L☉
Temperature14,100[6] K
Rotational velocity (v sin i)160[7] km/s
ν Gem Ab
Mass3.28[5] M☉
ν Gem B
Mass3.33[5] M☉
Other designations
ν Gem, 18 Geminorum, BD+20° 1441, FK5 1173, HD 45542, HIP 30883, HR 2343, SAO 78423, WDS 06290+2013[8]
Database references
SIMBADdata

The inner components of this multiple star system have an orbital period of about 54 days and a nearly circular orbit with an eccentricity of 0.056.[5] There is some uncertainty in the spectral type, with classifications ranging from a main sequence star to a giant. Orbiting the inner pair is a classical Be star, with an orbital period of 19.1 years and an eccentricity of 0.24.[5] The two orbits are co-directional and roughly coplanar. The system is overall dynamically stable, and shows no signs of Kozai-Lidov cycles. The outer Be star appears to be single.[5]

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, this star was titled as Nucatai.[10]


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. Crawford, D. L.; et al. (1971), "Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere", The Astronomical Journal, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.
  3. Cvetković, Z.; Ninković, S. (November 2008), "Orbits for two short-period and two long-period binaries", New Astronomy, 13 (8): 587–592, Bibcode:2008NewA...13..587C, doi:10.1016/j.newast.2008.03.005.
  4. Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
  5. Klement, Robert; Hadrava, Petr; Rivinius, Thomas; Baade, Dietrich; Cabezas, Mauricio; Heida, Marianne; Schaefer, Gail H.; Gardner, Tyler; Gies, Douglas R.; Anugu, Narsireddy; Lanthermann, Cyprien; Davies, Claire L.; Anderson, Matthew D.; Monnier, John D.; Ennis, Jacob; Labdon, Aaron; Setterholm, Benjamin R.; Kraus, Stefan; Ten Brummelaar, Theo A.; Le Bouquin, Jean-Baptiste (2021). "ν Gem: A Hierarchical Triple System with an Outer Be Star". The Astrophysical Journal. 916 (1): 24. arXiv:2105.13437. Bibcode:2021ApJ...916...24K. doi:10.3847/1538-4357/ac062c. S2CID 235247900.
  6. Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483.
  7. Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  8. "nu. Gem". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-12-06.{{cite web}}: CS1 maint: postscript (link)
  9. Blow, G. L.; et al. (November 1982), "Photoelectric observations of lunar occultations. XIII", Astronomical Journal, 87: 1571–1584, Bibcode:1982AJ.....87.1571B, doi:10.1086/113247.
  10. Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), California Institute of Technology: Jet Propulsion Laboratory, retrieved 2019-01-09.



На других языках

- [en] Nu Geminorum

[es] Ni Geminorum

Ni Geminorum (ν Gem / 18 Geminorum / HD 45542)[1][2] es una estrella múltiple en la constelación de Géminis de magnitud aparente +4,14. Se encuentra a unos 500 años luz de distancia del Sistema Solar.

[ru] Ню Близнецов

Ню Близнецов (ν Близнецов, Nu Geminorum, ν Geminorum, сокращ. nu Gem, ν Gem), — двойная звезда, а возможно даже кратная звезда[7] в северном зодиакальном созвездии Близнецов. Ню Близнецов имеет видимую звёздную величину +4.16m[2], и, согласно шкале Бортля, видна невооруженным глазом даже на городском небе (англ. City sky).


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