HR 3220

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This article is about B Carinae. For b1 Carinae, see V376 Carinae. For b2 Carinae, see HD 77370.
HR 3220
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 08h 09m 00.56958s[1]
Declination −61° 18′ 08.5836″[1]
Apparent magnitude (V) 4.75[2]
Characteristics
Spectral type F6 V Fe-0.8 CH-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: −113.750[1] mas/yr
Dec.: −297.923[1] mas/yr
Parallax (π)55.3398 ± 0.5399[1] mas
Distance58.9 ± 0.6 ly
(18.1 ± 0.2 pc)
Absolute magnitude (MV)+3.19[5]
Orbit[6]
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
Mass1.35[7] M☉
Radius1.50+0.13
−0.06[1] R☉
Luminosity3.6±0.4[1] L☉
Surface gravity (log g)4.12[7] cgs
Temperature6491+127
−259[1] K
Metallicity [Fe/H]−0.27[7] dex
Rotational velocity (v sin i)8.8[5] km/s
Age10[7] Gyr
B
Mass0.42+0.09
−0.05[7] M☉
Other designations
B Car, CPD−60°1074, FK5 2636, GJ 297.1, HD 68456, HIP 39903, HR 3220, SAO 250131[8]
Database references
SIMBADdata

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.[4]

This is a single-lined spectroscopic binary system with an orbital period of 2.46 years and an eccentricity of 0.12.[6] The visible component is an F-type main sequence star with a stellar classification of F6 V Fe-0.8 CH-0.4,[3] where the suffix notation indicates mild but anomalous underabundances of iron and the cyano 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.[7]

References[]

  1. ^ a b c d e f g h Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d 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. ^ a b 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, S2CID 119476992.
  4. ^ a b 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, S2CID 11027621.
  5. ^ a b 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.
  6. ^ a b Murdoch, K.; Hearnshaw, J. B. (June 1993), "The orbit of the spectroscopic binary HR 3220", The Observatory, 113: 126–127, Bibcode:1993Obs...113..126M.
  7. ^ a b c d e f 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.416..391F, doi:10.1111/j.1365-2966.2011.19042.x
  8. ^ "HD 68456". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-04.
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