Integrative Studies 410 Our Place in the Universe
... Describe how variable stars, e.g. Cepheids, can be used as cosmic yardsticks • k: Cepheid stars oscillate between two states: In one of the states, the star is compact and large temperature and pressure gradients build up in the star. These large pressures cause the star to expand. When the star is ...
... Describe how variable stars, e.g. Cepheids, can be used as cosmic yardsticks • k: Cepheid stars oscillate between two states: In one of the states, the star is compact and large temperature and pressure gradients build up in the star. These large pressures cause the star to expand. When the star is ...
Stellar Evolution Slideshow
... Gigantic stellar explosion Carbon core temp. rises to 600 million K! ...
... Gigantic stellar explosion Carbon core temp. rises to 600 million K! ...
Lecture 15 (pdf from the powerpoint)
... Space Telescope reveals The Cat's Eye Nebula to be one of the most complex planetary nebulae known. In fact, the features seen in the Cat's Eye are so complex that astronomers suspect the bright central object may actually be a binary star system. ...
... Space Telescope reveals The Cat's Eye Nebula to be one of the most complex planetary nebulae known. In fact, the features seen in the Cat's Eye are so complex that astronomers suspect the bright central object may actually be a binary star system. ...
Star Questions 2008 - Fort Thomas Independent Schools
... accumulates more matter than it had when it was on the main sequence, causing the core to grow to a size greater than 1.4 solar masses. ...
... accumulates more matter than it had when it was on the main sequence, causing the core to grow to a size greater than 1.4 solar masses. ...
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) ...
Stellar Nucleosynthesis
... • Work on stellar nucleosynthesis in the 1950s has led to our current realization that most of the chemical elements are synthesized in stars. • Helium is made by hydrogen burning in the core during the main sequence and in a shell above the core in the red giant phase. • The energy released from nu ...
... • Work on stellar nucleosynthesis in the 1950s has led to our current realization that most of the chemical elements are synthesized in stars. • Helium is made by hydrogen burning in the core during the main sequence and in a shell above the core in the red giant phase. • The energy released from nu ...
Integrative Studies 410 Our Place in the Universe
... • A shock wave travels through the star and blows off the outer layers, including the heavy elements – a supernova • A million times brighter than a nova!! • The actual explosion takes less than a second ...
... • A shock wave travels through the star and blows off the outer layers, including the heavy elements – a supernova • A million times brighter than a nova!! • The actual explosion takes less than a second ...
Astronomy - The-A-List
... sidereal period (P) around the Sun is directly proportional to the cube of the length of its orbit’s semimajor axis (a) P2 = a3, planet closer to the Sun has a shorter ...
... sidereal period (P) around the Sun is directly proportional to the cube of the length of its orbit’s semimajor axis (a) P2 = a3, planet closer to the Sun has a shorter ...
Elements from Stardust
... With the high pressure and hot temperature in the sun, nuclei of atoms are squeezed together and they collide. Nuclear fusion combines smaller nuclei into larger nuclei—making bigger and heavier atoms. ...
... With the high pressure and hot temperature in the sun, nuclei of atoms are squeezed together and they collide. Nuclear fusion combines smaller nuclei into larger nuclei—making bigger and heavier atoms. ...
Supernova Stalking - Susanna Kumlien Reportage
... a so-called Standard Candle. A Standard Candle is an object astronomers can use to measure distances in the universe, taking advantage of its known properties. With its distance from Earth of only some 12 million light years, considered to be “nearby” by cosmological standards, the supernova´s proxi ...
... a so-called Standard Candle. A Standard Candle is an object astronomers can use to measure distances in the universe, taking advantage of its known properties. With its distance from Earth of only some 12 million light years, considered to be “nearby” by cosmological standards, the supernova´s proxi ...
Ch.11 Massive star death
... • The Crab Nebula is the remnant of the supernova seen in A.D. 1054 ...
... • The Crab Nebula is the remnant of the supernova seen in A.D. 1054 ...
Stellar Evolution
... A Neutron Star With a thin crust of Iron. It begins to spin super-fast with a period is as little as a second! This generates a strong magnetic field and a beacon of radio energy that acts like a spinning search-light. That appear to us as a Pulsar, a source of a rhythmic radio signal first thought ...
... A Neutron Star With a thin crust of Iron. It begins to spin super-fast with a period is as little as a second! This generates a strong magnetic field and a beacon of radio energy that acts like a spinning search-light. That appear to us as a Pulsar, a source of a rhythmic radio signal first thought ...
Death of massive stars
... Type II supernovae are produced by the collapse and explosion of a massive star. They die away more sharply than the Type I (about 15 days), but then their magnitude plateaus until about 100 days past their explosion. They form from Population I stars in spiral galaxies. ...
... Type II supernovae are produced by the collapse and explosion of a massive star. They die away more sharply than the Type I (about 15 days), but then their magnitude plateaus until about 100 days past their explosion. They form from Population I stars in spiral galaxies. ...
SUPERNOVAE A. Supernovae.-Several years ago, Baade andI
... energies are well within and above the range of those observed in cosmic rays. Supernovae thus may well be regarded as a powerful source of cosmic rays. Baade and I have shown previously' that on the picture just discussed, combined with results, now available, of the frequency of supernovae, it is ...
... energies are well within and above the range of those observed in cosmic rays. Supernovae thus may well be regarded as a powerful source of cosmic rays. Baade and I have shown previously' that on the picture just discussed, combined with results, now available, of the frequency of supernovae, it is ...
Science Olympiad - Department of Physics and Astronomy
... Test your students’ understanding of Kepler’s third law, as well as the weight equation with my lab “Measuring the Mass of Jupiter”: ...
... Test your students’ understanding of Kepler’s third law, as well as the weight equation with my lab “Measuring the Mass of Jupiter”: ...
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... they are bright and hot—10,000 to 20,000 degrees Kelvin; that they are expanding rapidly at 10,000 kilometers per second; that they lack hydrogen; and that they take about 50 days to fade away—much l ...
... they are bright and hot—10,000 to 20,000 degrees Kelvin; that they are expanding rapidly at 10,000 kilometers per second; that they lack hydrogen; and that they take about 50 days to fade away—much l ...
HOU Supernova Light Curves
... Type II supernovas occur in regions with lots of bright, young stars, such as the spiral arms of galaxies. They apparently do not occur in elliptical galaxies, which are dominated by old, low-mass stars. Since bright young stars are typically stars with masses greater than about 10 times the mass o ...
... Type II supernovas occur in regions with lots of bright, young stars, such as the spiral arms of galaxies. They apparently do not occur in elliptical galaxies, which are dominated by old, low-mass stars. Since bright young stars are typically stars with masses greater than about 10 times the mass o ...
Chapter 20: Stellar Evolution: The Death of Stars PowerPoint
... – All elements heavier than iron require energy input • Core fusion cannot produce elements heavier than iron • All heavier elements are produced by other processes ...
... – All elements heavier than iron require energy input • Core fusion cannot produce elements heavier than iron • All heavier elements are produced by other processes ...
Linking Asteroids and Meteorites through Reflectance
... Things to remember • 90% of classified stars are on main sequence • Main sequence stars are “young” stars • If a star is leaving the main sequence, it is at the end of its lifespan of burning hydrogen into ...
... Things to remember • 90% of classified stars are on main sequence • Main sequence stars are “young” stars • If a star is leaving the main sequence, it is at the end of its lifespan of burning hydrogen into ...
Standard candles
... Supernovae occur when massive stars explode at the end of their lives. A white dwarf star in a binary pair with a red dwarf star steals mass from the red dwarf until it is too massive to support itself against gravity any more. Then its core collapses, starting a runaway nuclear reaction and a brigh ...
... Supernovae occur when massive stars explode at the end of their lives. A white dwarf star in a binary pair with a red dwarf star steals mass from the red dwarf until it is too massive to support itself against gravity any more. Then its core collapses, starting a runaway nuclear reaction and a brigh ...
AY 12 Homework #4 Solutions Winter 2016 Longer Problems 1. a
... magnetic field) being beamed in our direction in regular pulses as the magnetic field axis sweeps across our line of sight. c) Binary stellar massed x-ray sources are thought to be the result of a neutron star or black hole accreting mass from a companion star. If the x-ray emitting source can be sh ...
... magnetic field) being beamed in our direction in regular pulses as the magnetic field axis sweeps across our line of sight. c) Binary stellar massed x-ray sources are thought to be the result of a neutron star or black hole accreting mass from a companion star. If the x-ray emitting source can be sh ...
Stars: Their Life and Afterlife
... have an energy of ~1037 joules (1044 ergs), which is equivalent to the output of our Sun over 1000 years. The white dwarf and its companion survive the nova explosion, and in some cases repeated novae are possible! Type Ia supernovae appear to be initiated by a similar mechanism, but the details are ...
... have an energy of ~1037 joules (1044 ergs), which is equivalent to the output of our Sun over 1000 years. The white dwarf and its companion survive the nova explosion, and in some cases repeated novae are possible! Type Ia supernovae appear to be initiated by a similar mechanism, but the details are ...
Supernova
A supernova is a stellar explosion that briefly outshines an entire galaxy, radiating as much energy as the Sun or any ordinary star is expected to emit over its entire life span, before fading from view over several weeks or months. The extremely luminous burst of radiation expels much or all of a star's material at a velocity of up to 7007300000000000000♠30,000 km/s (10% of the speed of light), driving a shock wave into the surrounding interstellar medium. This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant. Supernovae are potentially strong galactic sources of gravitational waves. A great proportion of primary cosmic rays comes from supernovae.Supernovae are more energetic than novae. Nova means ""new"" in Latin, referring to what appears to be a very bright new star shining in the celestial sphere; the prefix ""super-"" distinguishes supernovae from ordinary novae, which are far less luminous. The word supernova was coined by Walter Baade and Fritz Zwicky in 1931. It is pronounced /ˌsuːpərnoʊvə/ with the plural supernovae /ˌsuːpərnoʊviː/ or supernovas (abbreviated SN, plural SNe after ""supernovae"").Supernovae can be triggered in one of two ways: by the sudden re-ignition of nuclear fusion in a degenerate star; or by the gravitational collapse of the core of a massive star. In the first case, a degenerate white dwarf may accumulate sufficient material from a companion, either through accretion or via a merger, to raise its core temperature, ignite carbon fusion, and trigger runaway nuclear fusion, completely disrupting the star. In the second case, the core of a massive star may undergo sudden gravitational collapse, releasing gravitational potential energy that can create a supernova explosion.The most recent directly observed supernova in the Milky Way was Kepler's Star of 1604 (SN 1604); remnants of two more recent supernovae have been found retrospectively. Observations in other galaxies indicate that supernovae should occur on average about three times every century in the Milky Way, and that any galactic supernova would almost certainly be observable in modern astronomical equipment. Supernovae play a significant role in enriching the interstellar medium with higher mass elements. Furthermore, the expanding shock waves from supernova explosions can trigger the formation of new stars.