Nu2 Columbae
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h 37m 44.618s[1] |
| Declination | −28° 41′ 22.88″[1] |
| Apparent magnitude (V) | 5.31[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | F5 V[3] |
| U−B color index | +0.10[2] |
| B−V color index | +0.46[2] |
| Astrometry | |
| Radial velocity (Rv) | +39.07±0.14[1] km/s |
| Proper motion (μ) | RA: −37.777 mas/yr[1] Dec.: +42.393 mas/yr[1] |
| Parallax (π) | 24.0801±0.0660 mas[1] |
| Distance | 135.4 ± 0.4 ly (41.5 ± 0.1 pc) |
| Absolute magnitude (MV) | +2.21[4] |
| Details | |
| Mass | 1.64±0.04[1] M☉ |
| Radius | 2.779±0.056[1] R☉ |
| Luminosity | 10.80+0.05 −0.06[1] L☉ |
| Surface gravity (log g) | 3.731+0.003 −0.005[1] cgs |
| Temperature | 6,276±2[1] K |
| Metallicity [Fe/H] | −0.11±0.15[5] dex |
| Rotational velocity (v sin i) | 27.2[6] km/s |
| Age | 1.93±0.23[1] Gyr |
| Other designations | |
| ν2 Col, CD−28°2321, HD 37495, HIP 26460, HR 1935, SAO 170613[7] | |
| Database references | |
| SIMBAD | data |
Nu2 Columbae is a solitary star[8] 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 24.08 mas,[1] it is estimated to lie at a distance of 135.4 light-years (41.5 pc) from the Sun. The star is drifting further away with a line of sight velocity component of +39 km/s.[9]
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 1.64 times the mass of the Sun and 2.8 times the Sun's radius.[1] X-ray emission has been detected from this star, with an estimated luminosity of 1.6×1029 erg/s.[4] It is about 1.9 billion years old[1] and is spinning with a projected rotational velocity of 27.2 km/s.[6] The star is radiating 10.8 times the luminosity of the Sun from its photosphere at an effective temperature of 6,276 K.[1]
References
[edit]- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875 Gaia DR3 record for this source at VizieR.
- 1 2 3 4 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.
- 1 2 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- 1 2 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.
- ↑ Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691.
- 1 2 Schröder, C.; et al. (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, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377
- ↑ "nu.02 Col", SIMBAD, Centre de données astronomiques de Strasbourg, 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ↑ 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, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
