Astronomy:HR 3220
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Carina |
| Right ascension | 08h 09m 00.56958s[1] |
| Declination | −61° 18′ 08.5836″[1] |
| Apparent magnitude (V) | 4.75[2] |
| Characteristics | |
| Evolutionary stage | Blue straggler[3] |
| Spectral type | F6 V Fe-0.8 CH-0.4[4] |
| U−B color index | −0.05[2] |
| B−V color index | +0.44[2] |
| Astrometry | |
| Radial velocity (Rv) | +23.7[5] km/s |
| Proper motion (μ) | RA: −113.750[1] mas/yr Dec.: −297.923[1] mas/yr |
| Parallax (π) | 55.3398 ± 0.5399[1] mas |
| Distance | 58.9 ± 0.6 ly (18.1 ± 0.2 pc) |
| Absolute magnitude (MV) | +3.19[6] |
| Orbit[7] | |
| Period (P) | 899.3±0.4 d |
| Semi-major axis (a) | ≥39.0±0.7 Gm |
| Eccentricity (e) | 0.119±0.012 |
| Periastron epoch (T) | 1,845±18 |
| Argument of periastron (ω) (secondary) | 135±5° |
| Semi-amplitude (K1) (primary) | 3.18±0.06 km/s |
| Details | |
| A | |
| Mass | 1.35[3] M☉ |
| Radius | 1.50+0.13 −0.06[1] R☉ |
| Luminosity | 3.6±0.4[1] L☉ |
| Surface gravity (log g) | 4.12[3] cgs |
| Temperature | 6491+127 −259[1] K |
| Metallicity [Fe/H] | −0.27[3] dex |
| Rotational velocity (v sin i) | 8.8[6] km/s |
| Age | 10[3] Gyr |
| B | |
| Mass | 0.42+0.09 −0.05[3] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
HR 3220 is a binary star system in the southern constellation of Carina. It has the Bayer designation B Carinae; HR 3220 is the designation from the Bright Star Catalogue. It has a yellow-white hue and is visible to the naked eye with an apparent visual magnitude of 4.75.[2] Based upon parallax measurements, it is located at a distance of 59 light years from the Sun. The system is drifting further away with a radial velocity of +24 km/s.[5]
This is a single-lined spectroscopic binary system with an orbital period of 2.46 years and an eccentricity of 0.12.[7] The visible component is an F-type main sequence star with a stellar classification of F6 V Fe-0.8 CH-0.4,[4] where the suffix notation indicates mild but anomalous underabundances of iron and the methylidyne radical. The secondary is most likely a helium white dwarf with 0.47 times the mass of the Sun. Mass transfer from the white dwarf progenitor has given the primary the spectral signature of a blue straggler that appears much younger than its actual age of about 10 billion years.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Fuhrmann, K. et al. (September 2011), "Discovery of the nearby F6V star HR 3220 as a field blue straggler", Monthly Notices of the Royal Astronomical Society 416 (1): 391–392, doi:10.1111/j.1365-2966.2011.19042.x, Bibcode: 2011MNRAS.416..391F
- ↑ 4.0 4.1 Gray, R. O. et al. (July 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): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
- ↑ 5.0 5.1 Nordström, B. et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics 418: 989–1019, doi:10.1051/0004-6361:20035959, Bibcode: 2004A&A...418..989N.
- ↑ 6.0 6.1 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, doi:10.1051/0004-6361/201118724, Bibcode: 2012A&A...542A.116A.
- ↑ 7.0 7.1 Murdoch, K.; Hearnshaw, J. B. (June 1993), "The orbit of the spectroscopic binary HR 3220", The Observatory 113: 126–127, Bibcode: 1993Obs...113..126M.
- ↑ "HD 68456". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+68456.
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