Information: - Arcturus, also designated AlphaBootis (Bootis, abbreviated AlphaBoo, Boo) is a star in the constellation of Bootes. It is relatively close at 36.7 light-years from the Sun. Together with Spica and Denebola (or Regulus, depending on the source), Arcturus is part of the Spring Triangle asterism and, by extension, also of the Great Diamond along with the star Cor Caroli. - In astronomy , the Arcturus Stream is a stellar stream which includes the nearby bright star Arcturus . It comprises many stars which share similar proper motion and so appear to be physically associated . This stream is not in the plane of the Milky Way galaxy and has been proposed as a remnant of an ancient dwarf satellite galaxy , long since disrupted and assimilated into the Milky Way . It consists of old stars deficient in heavy elements . However , Bensby and colleagues in analysing chemical composition of F and G dwarf stars in the solar neighbourhood found there was no difference in chemical makeup of stars from the stream , suggesting an intragalactic rather than extragalactic origin . Research from the Radial Velocity Experiment at the Australian Astronomical Observatory headed by Quentin Parker was first to quantify the nature of the stream , though astronomers had known of its existence for some time . It was first discovered in 1971 . Other members include the M - class stars 27 Cancri , Alpha Vulpeculae and RT Hydrae . - Cor Caroli is the traditional name for the binary star also designated Alpha Canum Venaticorum ( Canum Venaticorum, abbreviated Alpha CVn, CVn), although the International Astronomical Union now regards the name as only applying to the brightest component. Alpha CVn is the brightest point of light in the northern constellation of Canes Venatici. - Regulus, also designated Alpha Leonis ( Leonis, abbreviated Alpha Leo, Leo), is the brightest star in the constellation of Leo and one of the brightest stars in the night sky, lying approximately 79 light years from the Sun. Regulus is a multiple star system composed of four stars that are organized into two pairs. The spectroscopic binary Regulus A consists of a blue-white main-sequence star and its companion, which has not yet been directly observed, but is probably a white dwarf. Located farther away are Regulus B, C, and D, which are dim main-sequence stars. - Denebola, also designated Beta Leonis ( Leonis, abbreviated Beta Leo, Leo) is the third-brightest star in the zodiac constellation of Leo. It is an A-type main sequence star with 75% more mass than the Sun and fifteen times the Sun's luminosity. Based on parallax measurements from the Hipparcos astrometry satellite, the star is at a distance of about from the Sun. Its apparent visual magnitude is 2.14, making it readily visible to the naked eye. Denebola is a suspected Delta Scuti type variable star, meaning its luminosity varies very slightly over a period of a few hours. - Bootes is a constellation in the northern sky, located between 0 and +60 declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from the Greek , "Bots", meaning herdsman or plowman (literally, ox-driver; from "bous" cow). - The Spring Triangle is an astronomical asterism involving an imaginary triangle drawn upon the celestial sphere, with its defining vertices at Arcturus, Spica, and Regulus. This triangle connects the constellations of Bootes, Virgo, and Leo. It is visible rising in the south eastern sky of the northern hemisphere between March and May. - Spica, also designated Alpha Virginis ( Virginis, abbreviated Alpha Vir, Vir), is the brightest star in the constellation of Virgo and the 16th brightest star in the night sky. Analysis of its parallax shows that it is located 250 10 light years from the Sun. It is a spectroscopic binary and rotating ellipsoidal variable; a system whose two main stars are so close together they are egg-shaped rather than spherical, and can only be separated by their spectra. The primary is a blue giant and a variable star of the Beta Cephei type. - The Great Diamond is an asterism. Astronomy popularizer Hans A. Rey called it the Virgin's Diamond. It is composed of the stars Cor Caroli (in Canes Venatici), Denebola (the tail of Leo), Spica (the wheat of Virgo), and Arcturus (in Bootes). It is somewhat larger than the Big Dipper. What is the relationship between 'arcturus stream' and 'bootes'?
The answer to this question is:
constellation