HR 3220

Last updated
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
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  mas [1]
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
B Car, CPD−60°1074, FK5 2636, GJ 297.1, HD 68456, HIP 39903, HR 3220, SAO 250131 [8]
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. 1 2 3 4 5 6 7 8 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. 1 2 3 4 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. 1 2 3 4 5 6 7 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
  4. 1 2 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.
  5. 1 2 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.
  6. 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.
  7. 1 2 Murdoch, K.; Hearnshaw, J. B. (June 1993), "The orbit of the spectroscopic binary HR 3220", The Observatory, 113: 126–127, Bibcode:1993Obs...113..126M.
  8. ↑ "HD 68456". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-12-04.
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