Delta Columbae
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba[1] |
| Right ascension | 06h 22m 06.825s[2] |
| Declination | −33° 26′ 11.04″[2] |
| Apparent magnitude (V) | 3.85[3] |
| Characteristics | |
| Spectral type | G7 II[4] |
| U−B color index | +0.52[3] |
| B−V color index | +0.88[3] |
| Astrometry | |
| Radial velocity (Rv) | −2.6±0.9[5] km/s |
| Proper motion (μ) | RA: −22.946 mas/yr[2] Dec.: −52.045 mas/yr[2] |
| Parallax (π) | 15.049±0.4455 mas[2] |
| Distance | 217 ± 6 ly (66 ± 2 pc) |
| Absolute magnitude (MV) | −0.32[6] |
| Orbit[7][8] | |
| 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[2] M☉ |
| Radius | 15.1±0.5[2] R☉ |
| Luminosity | 128.5+7.5 −6.8[2] L☉ |
| Surface gravity (log g) | 2.41±0.01[2] cgs |
| Temperature | 5,006.0±1.5[2] K |
| Metallicity [Fe/H] | −0.04[9] dex |
| Rotational velocity (v sin i) | 4.8±0.2[6] km/s |
| Age | 271+33 −26[2] Myr |
| Other designations | |
| δ Col, CD−33°2927, HD 44762, HIP 30277, HR 2296, SAO 196735[10] | |
| 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.[3] The distance to this system, based upon an annual parallax shift of 13.94 mas,[2] 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.[11]
This is a single-lined spectroscopic binary system with an orbital period of 868.78 days and an eccentricity of 0.7.[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.[4] 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.[2] The star radiates around 129 times the solar luminosity from its photosphere at an effective temperature of 5,006 K.[2]
References
[edit]- ↑ 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.
