star. The companion star has a classification of A2 V, so it is a main sequence star that is generating energy through the thermonuclear fusion of hydrogen at its core. This star is rotating rapidly, with a projected rotational velocity of . It has a surface temperature of about and a radius nearly three times the Sun, leading to a bolometric luminosity 45 times that of the Sun. By the time the smaller main sequence star reaches the current point of the primary in its evolution, the larger star will have lost much of its mass in a planetary nebula and will have evolved into a white dwarf. The pair will have essentially changed roles: the brighter star becoming the dim dwarf, while the lesser companion will shine as a giant star. In culture In 1973, the Scottish astronomer and science fiction writer Duncan Lunan claimed to have managed to interpret a message caught in the 1920s by two Norwegian physicists that, according to his theory, came from a 13,000 year old satellite polar orbiting the Earth known as the Black Knight and sent there by the inhabitants of a planet orbiting Epsilon Boötis. The story was even reported in Time magazine. Lunan later withdrew his Epsilon Boötis theory, presenting proofs against it and clarifying why he was brought to formulate it in the first place, but later revoked his withdrawal. References External links Information page for HR 5506 (Izar) on VizieR Information page for HR 5505 (ε Boötes B) on VizieR Information page for CCDM J14449+2704 (all component stars) on VizieR Image of Epsilon Boötis List of constellations and named stars Izar star chart with viewing information on in-the-sky.org ε Boötes B star chart with viewing information on in-the-sky.org Binary stars Bootis, 36 129988 9 072105 Bootis, Epsilon Boötes K-type bright giants K-type giants A-type main-sequence stars Izar 5505 6 BD+27 2417