Nu1 Lupi
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.
| 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] |
| Distance | 117 ± 1 ly (35.9 ± 0.4 pc) |
| Absolute magnitude (MV) | +2.32[4] |
| Details | |
| Mass | 1.67[5] M☉ |
| Surface gravity (log g) | 3.87±0.10[5] cgs |
| Temperature | 6,447±80[5] K |
| Metallicity [Fe/H] | 0.17±0.05[5] dex |
| Rotational velocity (v sin i) | 2.8±0.2[4] km/s |
| Age | 2.0[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
References edit
- ^ 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.
- ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b 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.
- ^ a b c 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.
- ^ a b c d e f g 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.
- ^ "* nu.01 Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-08.
{{cite web}}: CS1 maint: postscript (link) - ^ 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.
- ^ a b 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.
- ^ 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.