Nu Andromedae

Not to be confused with V Andromedae, Andromeda V, or 5 Andromedae.
"ν And" redirects here. For other uses, see Vand.
Nu Andromedae
Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings


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[1] mas
Distance620 ± 20 ly
(189 ± 5 pc)
Absolute magnitude (MV)-1.86 ±0.07
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[7] R
Surface gravity (log g)4.12 ± 0.43[8] cgs
Temperature14,851 ± 396[8] K
Metallicity [Fe/H]+0.14 ± 0.17[8] dex
Rotational velocity (v sin i)20[9] 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.[10]

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.[11]

Nu Andromedae is the prominent blue star in the upper right of this image. At the center is the Andromeda Galaxy

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 are 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, ν Andromedae itself is known as 奎宿七 (Kuí Sù qī, English: the Seventh Star of Legs.)[12]

References

  1. 1 2 3 4 5 6 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.
  2. 1 2 3 4 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. 1 2 3 4 5 6 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.
  4. "Nu Andromedae, a blue main-sequence star in Andromeda". astrostudio.org. Retrieved 18 August 2014.
  5. 1 2 3 4 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.
  6. Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
  7. 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.
  8. 1 2 3 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.
  9. 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.
  10. "35 And -- Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-06-22.
  11. 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.
  12. (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日

External links


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