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Star Life Cycle

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... lines of ionized helium Zeta Orionis and highly ionized metals B blue 11,000 to 25,000 lines of neutral helium, Spica weak hydrogen lines Rigel A blue 7,500 to 11,000 strong lines of hydrogen, Vega to white ionzed metals, weak helium lines F white 6,000 to 7,500 hydrogen lines weaker than Canopus st ...
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Boötes



Boötes /boʊˈoʊtiːz/ 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 Βοώτης, Boōtēs, meaning herdsman or plowman (literally, ox-driver; from βοῦς bous “cow”). The ""ö"" in the name is a diaeresis, not an umlaut, meaning that each 'o' is to be pronounced separately.One of the 48 constellations described by the 2nd century astronomer Ptolemy, Boötes is now one of the 88 modern constellations. It contains the fourth brightest star in the night sky, the orange-hued Arcturus. Boötes is home to many other bright stars, including eight above the fourth magnitude and an additional 21 above the fifth magnitude, making a total of 29 stars easily visible to the naked eye.
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