The ConstellationsExplains the history, mythology, and science that make up the discipline of astronomy. Every constellation, from Andromeda to Virgo, is discussed and every important star, from Betelgeuse to Sirius, is explored. |
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Page 91
... million years ago as a blue - white giant . For a star , however , 100 million years is not a long time ! From that viewpoint , therefore , Betel- geuse has enjoyed relatively few years of vigor , aging very quickly in comparison to our ...
... million years ago as a blue - white giant . For a star , however , 100 million years is not a long time ! From that viewpoint , therefore , Betel- geuse has enjoyed relatively few years of vigor , aging very quickly in comparison to our ...
Page 92
... million degrees was reached at the center of Betelgeuse's homogeneous convective core , * energy was generated by the CN ( carbon - nitrogen ) thermonuclear cycle , in which carbon acts as a nuclear catalyst . In a series of six steps ...
... million degrees was reached at the center of Betelgeuse's homogeneous convective core , * energy was generated by the CN ( carbon - nitrogen ) thermonuclear cycle , in which carbon acts as a nuclear catalyst . In a series of six steps ...
Page 138
... million years . Aldebaran then suffered a slow increase in luminosity and size , with its diameter doubling in a billion more years . As the star began to leave the main sequence , it entered the “ subgiant ” phase of its evolution ...
... million years . Aldebaran then suffered a slow increase in luminosity and size , with its diameter doubling in a billion more years . As the star began to leave the main sequence , it entered the “ subgiant ” phase of its evolution ...
Contents
ONE Two Bears and a Dragon | 3 |
TWO Ursa Major and Ursa Minor | 25 |
THREE | 56 |
Copyright | |
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Common terms and phrases
absolute magnitude ALPHA ancient Andromeda apparent magnitude Arabic astronomical units BETA Betelgeuse blue-white bright brightest star called celestial Cepheids clouds companion components constellation Cygni degrees northwest degrees south diameter Dipper discovered double Earth east eclipsing elliptical emission EPSILON faint fainter fifth-magnitude fourth-magnitude galactic GAMMA gaseous globular cluster Greek Hale Observatories heavens helium Hercules Herschel hydrogen indicates interstellar ionized known lies light years distant luminosity luminous lying Lyrae main sequence main-sequence star Majoris miles per second Milky million miles naked-eye nebula northeast novae object observed open cluster optical optical companion orbit Orion parsecs period Perseus Photographed planetary primary proper motion RA 12 h radiation radio red giant Rigel rotation shell Sirius small telescope solar southeast southern southwest spectral class spectral lines spectral type spectroscopic binary spectrum spiral galaxy star's stellar subgiant Sun's supergiant supernova temperature Ursa Major variable velocity visible Zeta