HR 3220
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 08h 09m 00.67584s[1] |
| Declination | −61° 18′ 08.7391″[1] |
| Apparent magnitude (V) | 4.75[2] |
| Characteristics | |
| Spectral type | F6VFe-0.8CH-0.4[3] |
| U−B color index | −0.05[2] |
| B−V color index | +0.44[2] |
| Astrometry | |
| Radial velocity (Rv) | +23.7[4] km/s |
| Proper motion (μ) | RA: −150.05[1] mas/yr Dec.: −296.87[1] mas/yr |
| Parallax (π) | 50.05 ± 2.65[1] mas |
| Distance | 65 ± 3 ly (20 ± 1 pc) |
| Details | |
| Mass | 1.35[5] M☉ |
| Surface gravity (log g) | 4.12[5] cgs |
| Temperature | 6,365[5] K |
| Metallicity [Fe/H] | −0.27[5] dex |
| Rotational velocity (v sin i) | 8.8[6] km/s |
| Age | 10[5] Gyr |
| Other designations | |
HR 3220 (B Car) is a single-lined spectroscopic binary in the constellation Carina, approximately 65 light years from Earth. The primary is a F-type main sequence star with an apparent magnitude of +4.75. 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.[5]
References
- 1 2 3 4 5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
- 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data (SIMBAD), Bibcode:1986EgUBV........0M.
- ↑ 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, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
- ↑ 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, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959.
- 1 2 3 4 5 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, Bibcode:2011MNRAS.tmp..914F, doi:10.1111/j.1365-2966.2011.19042.x
- ↑ Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics 542: 31, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, A116.
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