From Wikipedia, the free encyclopedia
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
SIMBAD data

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]

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. ^ a b c d e f 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. ^ a b c d 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. ^ a b 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. ^ a b c d e f g h i 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. ^ a b 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.
  • Kaler, James B. (January 26, 2007), "Nu Geminorum", stars, University of Illinois, retrieved 2016-12-07.
From Wikipedia, the free encyclopedia
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
SIMBAD data

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]

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. ^ a b c d e f 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. ^ a b c d 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. ^ a b 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. ^ a b c d e f g h i 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. ^ a b 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.
  • Kaler, James B. (January 26, 2007), "Nu Geminorum", stars, University of Illinois, retrieved 2016-12-07.

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