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Nu Andromedae (Nu And, ν Andromedae, ν And) is a binary star in the constellation Andromeda. The system has an apparent visual magnitude of 4.5,[2] which is bright enough to be seen with the naked eye. It is approximately 620 light-years (190 parsecs) from Earth.[1] Situated just over a degree to the west of this star is the Andromeda Galaxy.[12]

Nu Andromedae is the prominent blue star in the upper right of this image. At the center is the Andromeda Galaxy.
Nu Andromedae is the prominent blue star in the upper right of this image. At the center is the Andromeda Galaxy.
Not to be confused with Andromeda V or 5 Andromedae.
"ν And" redirects here. For other uses, see Vand.
Nu Andromedae
Location of ν Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 49m 48.84737s[1]
Declination +41° 04′ 44.0764″[1]
Apparent magnitude (V) 4.522[2]
Characteristics
Spectral type B4/5 V[3][4] + F8 V[5]
U−B color index –0.573[2]
B−V color index –0.136[2]
Astrometry
Radial velocity (Rv)–23.9[6] km/s
Proper motion (μ) RA: +22.77 ±0.12[1] mas/yr
Dec.: –18.35 ±0.09[1] mas/yr
Parallax (π)5.28 ± 0.15 mas[1]
Distance620 ± 20 ly
(189 ± 5 pc)
Absolute magnitude (MV)−1.85[7]
Orbit[5]
Period (P)4.2827 d
Eccentricity (e)0.03
Longitude of the node (Ω)25.°
Periastron epoch (T)18155.67
Semi-amplitude (K1)
(primary)		71.7 km/s
Semi-amplitude (K2)
(secondary)		101.9 km/s
Details
ν And A
Mass5.9 ± 0.2[3] M☉
Radius3.4[8] R☉
Luminosity1,104[7] L☉
Surface gravity (log g)4.12 ± 0.43[9] cgs
Temperature14,851 ± 396[9] K
Metallicity [Fe/H]+0.14 ± 0.17[9] dex
Rotational velocity (v sin i)20[10] km/s
Age63.1 ± 17.9[3] Myr
Other designations
ν Andromedae, ν And, Nu And, Nu Andromedae 35 Andromedae, 35 And, BD+40 171, FK5 1021, HD 4727, HIP 3881, HR 226, SAO 36699.[11]
Database references
SIMBADdata

Nu Andromedae is spectroscopic binary[3] system with a nearly circular orbit that has a period of 4.2828 days.[5] The primary component is a B-type main sequence star with a stellar classification of B5 V.[3] The fainter secondary has a classification of F8 V,[5] which makes it an F-type main sequence star. The pair is about 63 million years old.[3]


Naming


In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of ν Andromedae, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, μ Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ1 Piscium. Consequently, the Chinese name for ν Andromedae itself is 奎宿七 (Kuí Sù qī, English: the Seventh Star of Legs.)[13]


References


  1. van Leeuwen, F. (November 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), "UBV photometry of FK4 and FK4 supplement stars", Astronomy and Astrophysics Supplement Series, 52: 131–134, Bibcode:1983A&AS...52..131O.
  3. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
  4. "Nu Andromedae, a blue main-sequence star in Andromeda". astrostudio.org. Archived from the original on 23 September 2015. Retrieved 18 August 2014.
  5. Pourbaix, D.; et al. (September 2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
  6. 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.
  7. 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.
  8. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  9. Koleva, M.; Vazdekis, A. (February 2012), "Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library", Astronomy & Astrophysics, 538: A143, arXiv:1111.5449, Bibcode:2012A&A...538A.143K, doi:10.1051/0004-6361/201118065, S2CID 53999614.
  10. Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  11. "35 And -- Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-06-22.
  12. Mollise, Rod (2006), The Urban Astronomer's Guide: A Walking Tour of the Cosmos for City Sky Watchers, Patrick Moore's Practical Astronomy Series, Springer, p. 178, ISBN 1846282160.
  13. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日



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На других языках

[de] Ny Andromedae

ν Andromedae (Ny Andromedae, kurz ν And) ist mit einer scheinbaren Helligkeit von 4,53m[2] ein dem bloßen Auge recht lichtschwach erscheinender bläulicher Stern im Zentrum des Sternbilds Andromeda, nur einen Grad östlich der Andromedagalaxie (M31) gelegen.[6][8] Nach Parallaxen-Messungen der Raumsonde Gaia ist ν And circa 564 Lichtjahre von der Erde entfernt.[1] Die Radialgeschwindigkeit des Sterns beträgt nach dem Eintrag in einem 1953 veröffentlichten Katalog −23,9 km/s.[4] Dieser Wert stimmt gut mit jenem im erweiterten Hipparcos-Katalog angegebenen von (−23,50 ± 4,20) km/s[3] überein, weicht aber stark von dem von Gaia gemessenen Wert von (+47,62 ± 4,52) km/s ab.[1]
- [en] Nu Andromedae

[es] Ni Andromedae

Ni Andromedae o Nu Andromedae (ν And / 35 Andromedae / HD 4727)[1][2] es una estrella en la constelación de Andrómeda de magnitud aparente +4,53. Se encuentra a unos 680 años luz del Sistema Solar.

[ru] Ню Андромеды

Ню Андромеды (лат. ν Andromedae), 35 Андромеды (лат. 35 Andromedae), HD 4727 — двойная звезда в созвездии Андромеды. Система имеет видимую звёздную величину в +4,5, которая является достаточно яркой, чтобы быть видимой невооружённым глазом. Она находится приблизительно в 620 световых годах от Земли. На угловом расстоянии чуть более 1 градуса к западу от этой звезды видна Галактика Андромеды.


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