HR 3220
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. 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. This is a single-lined spectroscopic binary system with an orbital period of and an eccentricity of  0.12. The visible component is an F-type main sequence star with a stellar classification of , 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.