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Nu1 Lupi (ν1 Lup) is a solitary[7] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 5.01.[2] It is a high proper motion star[8] with an annual parallax shift of 27.89[1] mas as seen from Earth, yielding a distance estimate of 117 light years from the Sun.

Nu1 Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 22m 08.27124s[1]
Declination −47° 55′ 40.0543″[1]
Apparent magnitude (V) 5.01[2]
Characteristics
Spectral type F6 III-IV[3]
U−B color index +0.04[2]
B−V color index +0.50[2]
Astrometry
Proper motion (μ) RA: −141.19[1] mas/yr
Dec.: −132.92[1] mas/yr
Parallax (π)27.89 ± 0.33 mas[1]
Distance117 ± 1 ly
(35.9 ± 0.4 pc)
Absolute magnitude (MV)+2.32[4]
Details
Mass1.67[5] M☉
Surface gravity (log g)3.87±0.10[5] cgs
Temperature6,447±80[5] K
Metallicity [Fe/H]0.17±0.05[5] dex
Rotational velocity (v sin i)2.8±0.2[4] km/s
Age2.0[5] Gyr
Other designations
ν1 Lup, CD−47° 9922, FK5 3211, HD 136351, HIP 75206, HR 5698, SAO 225703.[6]
Database references
SIMBADdata

This is a two[5] billion year old evolved star with a stellar classification of F6 III-IV,[3] indicating that the spectrum has characteristics intermediate between a subgiant and giant star. It is most likely the source of X-ray emission[8] detected at these coordinates with a luminosity of 1.09×1029 erg s−1.[9] The star has an estimated 1.67[5] times the mass of the Sun and is spinning slowly with a projected rotational velocity of 2.8 km/s.[4]


See also



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. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–70, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
  4. Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
  5. Bensby, T.; et al. (2014), "Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the solar neighbourhood", Astronomy & Astrophysics, 562 (A71): 28, arXiv:1309.2631, Bibcode:2014A&A...562A..71B, doi:10.1051/0004-6361/201322631, S2CID 118786105.
  6. "* nu.01 Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-08.{{cite web}}: CS1 maint: postscript (link)
  7. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  8. Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.
  9. Pizzolato, N.; et al. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P.

На других языках

- [en] Nu1 Lupi

[es] Ni1 Lupi

Ni1 Lupi (ν1 Lup / HD 136351 / GJ 3901) es una estrella de la constelación de Lupus, el lobo, de magnitud aparente +4,96. Comparte la denominación de Bayer Ni con ν2 Lupi, de la que está separada visualmente 23 minutos de arco. Las dos estrellas no están físicamente relacionadas, ya que mientras Ni1 Lupi se encuentra a 111 años luz de distancia, Ni2 Lupi se encuentra a sólo 47 años luz.

[ru] Ню¹ Волка

Ню¹ Волка (лат. ν¹ Lupi), HD 136351 — одиночная звезда в созвездии Волка на расстоянии приблизительно 114 световых лет (около 34,9 парсеков) от Солнца. Видимая звёздная величина звезды — +5,048m[5]. Возраст звезды определён как около 2,34 млрд лет[4].


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