Stellar Properties
... what would be the distance to the star? A)1/5, b)1. c)5, d)25 pc 2. Star A and B have same luminosity. If star A is 4 times closer to Earth then star B, then _____ to earthly viewer.: a=A is 4 x brighter, b=B is 4x brighter, c=A is 16 times brighter d=B is 16 times brighter, e=A is 64x brighter 3. A ...
... what would be the distance to the star? A)1/5, b)1. c)5, d)25 pc 2. Star A and B have same luminosity. If star A is 4 times closer to Earth then star B, then _____ to earthly viewer.: a=A is 4 x brighter, b=B is 4x brighter, c=A is 16 times brighter d=B is 16 times brighter, e=A is 64x brighter 3. A ...
Evolution Cycle of Stars
... • White dwarfs have a mass similar to that of the Sun, but only 1% of the Sun's diameter; approximately the diameter of the Earth. The surface temperature of a white dwarf is 8000C or more, but being smaller than the Sun their overall luminosity's are 1% of the Sun or less. • White dwarfs are the sh ...
... • White dwarfs have a mass similar to that of the Sun, but only 1% of the Sun's diameter; approximately the diameter of the Earth. The surface temperature of a white dwarf is 8000C or more, but being smaller than the Sun their overall luminosity's are 1% of the Sun or less. • White dwarfs are the sh ...
Constellation Information
... with the naked eye as a dim, fuzzy patch if you have a clear, moonless evening at an observing site far from light pollution. M44 is also known as the Beehive Cluster, because in binoculars or a low-power, wide-field telescope, it looks like an old-fashion done-shaped beehive with many extra bees ...
... with the naked eye as a dim, fuzzy patch if you have a clear, moonless evening at an observing site far from light pollution. M44 is also known as the Beehive Cluster, because in binoculars or a low-power, wide-field telescope, it looks like an old-fashion done-shaped beehive with many extra bees ...
formation of stars
... In a stable state a star’s diameter and radiation remain constant for billions of years. When so many of the core’s light nuclei are used up that the energy of fusion no longer balances the force of gravity the star loses its stability. When the star loses its stability the centre of the star contra ...
... In a stable state a star’s diameter and radiation remain constant for billions of years. When so many of the core’s light nuclei are used up that the energy of fusion no longer balances the force of gravity the star loses its stability. When the star loses its stability the centre of the star contra ...
Summer 2001 Day 07: Intro to Solar System
... 4) What does the brightness of a star depend on? A) Define brightness as the watts/m2 received from a star. B) Brightness follows an inverse square relation B=L/(4πR2). Draw the picture (see figure 54.2 C) Calculate the brightness of the Sun as seen from Earth B=1,355 W/m2 i) Typical stellar brightn ...
... 4) What does the brightness of a star depend on? A) Define brightness as the watts/m2 received from a star. B) Brightness follows an inverse square relation B=L/(4πR2). Draw the picture (see figure 54.2 C) Calculate the brightness of the Sun as seen from Earth B=1,355 W/m2 i) Typical stellar brightn ...
Big bang and Stars
... Energy released from nuclear fusion counteracts inward force of gravity. Throughout its life, these two forces determine the stages of a star’s life. ...
... Energy released from nuclear fusion counteracts inward force of gravity. Throughout its life, these two forces determine the stages of a star’s life. ...
File
... as they orbit the Sun, material ________ forming the tail the tail _______ points away from the Sun Halley's comet orbits the Sun every ____ years (1986) Meteors and Meteorites Earth is bombarded everyday by _____ and ______ fragments from space when one of the objects _______ up generatin ...
... as they orbit the Sun, material ________ forming the tail the tail _______ points away from the Sun Halley's comet orbits the Sun every ____ years (1986) Meteors and Meteorites Earth is bombarded everyday by _____ and ______ fragments from space when one of the objects _______ up generatin ...
The HR Diagram
... • Where are stars most of their lives? • Where are they when they begin to die? • What are they after they use up their ...
... • Where are stars most of their lives? • Where are they when they begin to die? • What are they after they use up their ...
18.1 NOTES How are stars formed? Objective: Describe how stars
... off heat and light. The Sun is only one of billions of stars that make up are galaxy, and there are billions of galaxies. Most stars appear to be white in color. However, there are blue, white, yellow, orange, and red stars. The color of a star determines how hot in temperature it is. Stars differ i ...
... off heat and light. The Sun is only one of billions of stars that make up are galaxy, and there are billions of galaxies. Most stars appear to be white in color. However, there are blue, white, yellow, orange, and red stars. The color of a star determines how hot in temperature it is. Stars differ i ...
Galaxies - Where Science Meets Life
... to a trillion stars. Although they are not counted, scientist can estimate from the size and brightness of a galaxy, the number of sun-sized stars the galaxy may have. ...
... to a trillion stars. Although they are not counted, scientist can estimate from the size and brightness of a galaxy, the number of sun-sized stars the galaxy may have. ...
Integrative Studies 410 Our Place in the Universe
... • Main-sequence star; pressure from nuclear fusion and gravity are in balance – Duration ~ 10 billion years (much longer than all other stages combined) – Temperature ~ 15 million K at core, 6000 K at surface – Size ~ Sun ...
... • Main-sequence star; pressure from nuclear fusion and gravity are in balance – Duration ~ 10 billion years (much longer than all other stages combined) – Temperature ~ 15 million K at core, 6000 K at surface – Size ~ Sun ...
Life Cycle of Stars
... much faster than smaller stars 4. Their main sequence may last only a few hundred thousand years 5. Smaller stars will live on for billions of years because they burn their fuel much more slowly ...
... much faster than smaller stars 4. Their main sequence may last only a few hundred thousand years 5. Smaller stars will live on for billions of years because they burn their fuel much more slowly ...
The Brightness of Stars
... a certain color range The filters are simply colored glass that goes over the mirror or lens of a telescope Astronomers say Vega has an MV of 0, which means Vega has an absolute magnitude of 0 in the V (for visible--no filters) color band ...
... a certain color range The filters are simply colored glass that goes over the mirror or lens of a telescope Astronomers say Vega has an MV of 0, which means Vega has an absolute magnitude of 0 in the V (for visible--no filters) color band ...
Some formulas for astronomy ASTR 122 Fall Quarter 2007 D. E.
... E = hν where h is a constant (“Planck’s constant”). ...
... E = hν where h is a constant (“Planck’s constant”). ...
1 - Stellar Life Cycle
... center of the new star, this heats stops the rest of the star from collapsing. The balance between gravity trying to make the star shrink and heat holding it up is called Thermodynamic Equilibrium. The star then stays almost exactly the same for a long time (about 10 billion years for a star lik ...
... center of the new star, this heats stops the rest of the star from collapsing. The balance between gravity trying to make the star shrink and heat holding it up is called Thermodynamic Equilibrium. The star then stays almost exactly the same for a long time (about 10 billion years for a star lik ...
Stars - Red, Blue, Old, New pt.3
... • At some stages stars can pulsate on timescales of days. • They constantly lose mass from outer layers. • We can follow these changes by calculating evolutionary tracks. ...
... • At some stages stars can pulsate on timescales of days. • They constantly lose mass from outer layers. • We can follow these changes by calculating evolutionary tracks. ...
Problem set 2
... specific intensity), you do not need to know the distance or luminosity, but only the temperature and angle subtended! Both of these are direct observables, unlike distance and luminosity . . . (c) Show that the answer to the previous part is the same as you would get by the more obvious but unneces ...
... specific intensity), you do not need to know the distance or luminosity, but only the temperature and angle subtended! Both of these are direct observables, unlike distance and luminosity . . . (c) Show that the answer to the previous part is the same as you would get by the more obvious but unneces ...
Science Centre Talk
... 25 neutrinos = all extragalactic neutrino astronomy...confirms core-collapse model (and limits neutrino mass) ...
... 25 neutrinos = all extragalactic neutrino astronomy...confirms core-collapse model (and limits neutrino mass) ...
THE LIFE CYCLE OF A STAR
... This is very small, hot star, the last stage in the life cycle of a star like the Sun. White dwarfs have a mass similar to that of the Sun, but only 1% of the Sun's diameter; approximately the diameter of the Earth. The surface temperature of a white dwarf is 8000C or more, but being smaller than th ...
... This is very small, hot star, the last stage in the life cycle of a star like the Sun. White dwarfs have a mass similar to that of the Sun, but only 1% of the Sun's diameter; approximately the diameter of the Earth. The surface temperature of a white dwarf is 8000C or more, but being smaller than th ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.