 ν Geminorum in optical light | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06 28 57.78613 |
| Declination | +20° 12′ 43.6856″ |
| Apparent magnitude (V) | 4.16 |
| Characteristics | |
| Spectral type | B6 III + B8 III |
| U−B color index | −0.47 |
| B−V color index | −0.13 |
| Astrometry | |
| Radial velocity (Rv) | +39.4 km/s |
| Proper motion (μ) | RA: −6.82 mas/yr Dec.: −13.10 mas/yr |
| Parallax (π) | 5.99 ± 0.28 mas |
| Distance | 540 ± 30 ly (167 ± 8 pc) |
| Absolute magnitude (MV) | −2.2 + −1.2 |
| Orbit | |
| Primary | ν Gem Aa |
| Companion | ν 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 | |
| Primary | ν Gem A |
| Companion | ν 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 | |
| Mass | 3.34 M☉ |
| Luminosity | 1,380 L☉ |
| Temperature | 14,100 K |
| Rotational velocity (v sin i) | 160 km/s |
| ν Gem Ab | |
| Mass | 3.28 M☉ |
| ν Gem B | |
| Mass | 3.33 M☉ |
| Other designations | |
| ν Gem, 18 Geminorum, BD+20° 1441, FK5 1173, HD 45542, HIP 30883, HR 2343, SAO 78423, WDS 06290+2013 | |
| Database references | |
| SIMBAD | data |
Nu Geminorum, Latinized from ν Geminorum, is a triple star system in the constellation Gemini. It has an apparent visual magnitude of 4.16, 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, 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.
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. 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. 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.
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.
References
- ^ 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.
- ^ 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.
- ^ 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.
- 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.
- ^ 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.
- ^ 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.
- 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.
- "nu. Gem". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-12-06.
{{cite web}}: CS1 maint: postscript (link) - 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.
- 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.
External links
- Kaler, James B. (January 26, 2007), "Nu Geminorum", stars, University of Illinois, retrieved 2016-12-07.
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