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 90
... increase in the mass of a star results in a much greater increase in its luminosity . The mathematical rule here is that the luminosity increases approximately as the fourth power of its mass . For example , if the star were to have ...
... increase in the mass of a star results in a much greater increase in its luminosity . The mathematical rule here is that the luminosity increases approximately as the fourth power of its mass . For example , if the star were to have ...
Page 138
... increase in its rate of hydrogen burning , after another 100 million years its luminosity increased again , reaching 125 times the Sun's luminosity , and it expanded quickly to about its present size , its expansion causing a further ...
... increase in its rate of hydrogen burning , after another 100 million years its luminosity increased again , reaching 125 times the Sun's luminosity , and it expanded quickly to about its present size , its expansion causing a further ...
Page 227
... increase in luminosity of an RR Lyrae star just before the break in its velocity curve . Two sets of absorption lines in its spectrum also occur for a short time while the brightness is increasing , one of these arising from surface ...
... increase in luminosity of an RR Lyrae star just before the break in its velocity curve . Two sets of absorption lines in its spectrum also occur for a short time while the brightness is increasing , one of these arising from surface ...
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