Delta Columbae
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 22m 06.825s |
| Declination | −33° 26′ 11.04″ |
| Apparent magnitude (V) | 3.85 |
| Characteristics | |
| Spectral type | G7 II |
| U−B color index | +0.52 |
| B−V color index | +0.88 |
| Astrometry | |
| Radial velocity (Rv) | −2.6±0.9 km/s |
| Proper motion (μ) | RA: −22.946 mas/yr Dec.: −52.045 mas/yr |
| Parallax (π) | 15.049±0.4455 mas |
| Distance | 217 ± 6 ly (66 ± 2 pc) |
| Absolute magnitude (MV) | −0.32 |
| Orbit | |
| Period (P) | 868.78 d |
| Semi-major axis (a) | 9.02±0.52 mas |
| Eccentricity (e) | 0.7 |
| Inclination (i) | 116.3±4.2° |
| Periastron epoch (T) | 2419915.02 JD |
| Argument of periastron (ω) (secondary) | 117.1° |
| Semi-amplitude (K1) (primary) | 10.6 km/s |
| Details | |
| δ Col A | |
| Mass | 3.401+0.04 −0.11 M☉ |
| Radius | 15.1±0.5 R☉ |
| Luminosity | 128.5+7.5 −6.8 L☉ |
| Surface gravity (log g) | 2.41±0.01 cgs |
| Temperature | 5,006.0±1.5 K |
| Metallicity [Fe/H] | −0.04 dex |
| Rotational velocity (v sin i) | 4.8±0.2 km/s |
| Age | 271+33 −26 Myr |
| Other designations | |
| δ Col, CD−33°2927, HD 44762, HIP 30277, HR 2296, SAO 196735 | |
| Database references | |
| SIMBAD | data |
Delta Columbae is a binary star system in the constellation Columba. Its name is a Bayer designation that is Latinized from δ Columbae, and abbreviated Delta Col or δ Col. This system can be seen with the naked eye as a point of light, having an apparent visual magnitude of 3.85. The distance to this system, based upon an annual parallax shift of 13.94 mas, is approximately 217 light-years (66 pc).
Delta Columbae was a latter designation of 3 Canis Majoris, as the early astronomers Johann Bayer and John Flamsteed did not include the constellation Columba in their star charts.
This is a single-lined spectroscopic binary system with an orbital period of 868.78 days and an eccentricity of 0.7. It has a peculiar velocity of 30.2±3.9 km/s, making it a candidate runaway star system. The primary component is a G-type bright giant star with a stellar classification of G7 II. At an age of 271 million years, it has 3.4 times the mass of the Sun and has expanded to 15 times the Sun's radius. The star radiates around 129 times the solar luminosity from its photosphere at an effective temperature of 5,006 K.
References
- ↑ Roman, Nancy G. (1987), "Identification of a constellation from a position", Publications of the Astronomical Society of the Pacific, 99 (617): 695, Bibcode:1987PASP...99..695R, doi:10.1086/132034. Constellation record for this object at VizieR.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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. (1999), "UBVRIJKL photometry of the bright stars", Commission Lunar and Planetary Laboratory, 4: 99, Bibcode:1966CoLPL...4...99J.
- 1 2 Tetzlaff, N.; et al. (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, S2CID 118629873.
- ↑ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
- 1 2 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.
- 1 2 Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- ↑ Jancart, S.; et al. (October 2005), "Astrometric orbits of SB9 stars", Astronomy and Astrophysics, 442 (1): 365–380, arXiv:astro-ph/0507695, Bibcode:2005A&A...442..365J, doi:10.1051/0004-6361:20053003, S2CID 15123997.
- ↑ Luck, R. Earle (2014), "Parameters and Abundances in Luminous Stars", The Astronomical Journal, 147 (6): 137, Bibcode:2014AJ....147..137L, doi:10.1088/0004-6256/147/6/137.
- ↑ "del Col", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2016-12-21.
- ↑ Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy, 18 (3): 209–223, Bibcode:1987JHA....18..209W, doi:10.1177/002182868701800305, S2CID 118445625.
