HR 3220

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
Distance	58.9 ± 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
Mass	1.35[7] M☉
Radius	1.50+0.13; −0.06[1] R☉
Luminosity	3.6±0.4[1] L☉
Surface gravity (log g)	4.12[7] cgs
Temperature	6491+127; −259[1] K
Metallicity [Fe/H]	−0.27[7] dex
Rotational velocity (v sin i)	8.8[5] km/s
Age	10[7] Gyr
B
Mass	0.42+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
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.[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

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.
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.
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.
Murdoch, K.; Hearnshaw, J. B. (June 1993), "The orbit of the spectroscopic binary HR 3220", The Observatory, 113: 126–127, Bibcode:1993Obs...113..126M.
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
"HD 68456". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-04.

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[GaiaDR2-1] 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.

[MERMILLIOD-2] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.

[aj132_1_161-3] 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.

[aaa418_989-4] 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.

[AmmlerVonEiff2012-5] 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.

[Murdoch1993-6] Murdoch, K.; Hearnshaw, J. B. (June 1993), "The orbit of the spectroscopic binary HR 3220", The Observatory, 113: 126–127, Bibcode:1993Obs...113..126M.

[mnras416_391-7] 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

[SIMBAD-8] "HD 68456". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-04.