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 mas [1] |
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 | |
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 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. [7]
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 mas [1] |
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 | |
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 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. [7]