Astronomy:Nu2 Columbae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h 37m 44.61799s[1] |
| Declination | −28° 41′ 22.8863″[1] |
| Apparent magnitude (V) | 5.31[2] |
| Characteristics | |
| Spectral type | F5 V[3] |
| U−B color index | +0.10[2] |
| B−V color index | +0.46[2] |
| Astrometry | |
| Radial velocity (Rv) | +38.0±2.6[4] km/s |
| Proper motion (μ) | RA: −37.66[1] mas/yr Dec.: +42.42[1] mas/yr |
| Parallax (π) | 24.51 ± 0.29[1] mas |
| Distance | 133 ± 2 ly (40.8 ± 0.5 pc) |
| Absolute magnitude (MV) | +2.21[5] |
| Details | |
| Mass | 1.65[4] M☉ |
| Radius | 1.6[6] R☉ |
| Luminosity | 10[7] L☉ |
| Surface gravity (log g) | 3.91[8] cgs |
| Temperature | 6,473±80[4] K |
| Metallicity [Fe/H] | −0.11±0.15[9] dex |
| Rotational velocity (v sin i) | 27.2[8] km/s |
| Age | 1.8[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nu2 Columbae is a solitary star[11] in the southern constellation of Columba. It can be seen with the naked eye, having an apparent visual magnitude of 5.31.[2] With an annual parallax shift of 24.51 mas,[1] it is estimated to lie about 133 light years from the Sun.
This star has a stellar classification of F5 V,[3] indicating that it is an F-type main sequence star that is generating energy through the thermonuclear fusion of hydrogen into helium in its core region. It has about 1.65 times the mass of the Sun[4] and 1.6 times the Sun's radius.[6] X-ray emission has been detected from this star, with an estimated luminosity of 1.6×1029 erg/s.[5] It is about 1.8 billion years old[4] and is spinning with a projected rotational velocity of 27.2 km/s.[8] The star is radiating about 10 times the solar luminosity from its outer atmosphere[7] at an effective temperature of 6,473 K.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Casagrande, L. et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics 530 (A138): 21, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 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, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 8.0 8.1 8.2 Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics 493 (3): 1099–1107, doi:10.1051/0004-6361:200810377, Bibcode: 2009A&A...493.1099S, http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2[yes|permanent dead link|dead link}}]
- ↑ Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1 354: 310–332, doi:10.1086/168691, Bibcode: 1990ApJ...354..310B.
- ↑ "nu.02 Col -- Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=nu2+Col, retrieved 2016-12-30.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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