Life Cycle of Star Pictures
... Our Sun is an average star that formed from a nebula. It produces its own heat and light by nuclear reactions. They live for billions of years before becoming a red giant. ...
... Our Sun is an average star that formed from a nebula. It produces its own heat and light by nuclear reactions. They live for billions of years before becoming a red giant. ...
The Sun has been stable for 4 billion years.
... Protons all have positive electric charge, so they repel each other electromagnetically. But they attract each other by the strong nuclear force. The strong nuclear force works only over very short distances. Small nuclei are smaller than the range of the strong nuclear force. If you add a particle, ...
... Protons all have positive electric charge, so they repel each other electromagnetically. But they attract each other by the strong nuclear force. The strong nuclear force works only over very short distances. Small nuclei are smaller than the range of the strong nuclear force. If you add a particle, ...
Stars & Constellations
... found North, they could observe its height in the sky and hence work out their latitude (how far North / South they are). Now they know how far North they are + the direction they’re traveling ...
... found North, they could observe its height in the sky and hence work out their latitude (how far North / South they are). Now they know how far North they are + the direction they’re traveling ...
Stellar Spectrum Characteristics and Black Body Radiation
... blackbody radiation being emitted from the deeper regions will be more intense than the blackbody radiation being emitted close to the surface where the temperature is lower. ...
... blackbody radiation being emitted from the deeper regions will be more intense than the blackbody radiation being emitted close to the surface where the temperature is lower. ...
FUN THINGS TO DO
... wandering around during the day and maybe checking out the stars at night. What constellations would the dinosaurs have seen back then? They would be different ones from those we see now! ...
... wandering around during the day and maybe checking out the stars at night. What constellations would the dinosaurs have seen back then? They would be different ones from those we see now! ...
Theory of Massive Star Formation
... • Thermal radiation field: since τ >> 1 spectrum is thermal, integrate over ν • Flux‐limited diffusion: since τ >> 1, flux F ∝ ‐∇E • Build these approximations into the ORION adaptive mesh refinement code (Krumholz+ 2007), which also includes gravity and protostellar evolution ...
... • Thermal radiation field: since τ >> 1 spectrum is thermal, integrate over ν • Flux‐limited diffusion: since τ >> 1, flux F ∝ ‐∇E • Build these approximations into the ORION adaptive mesh refinement code (Krumholz+ 2007), which also includes gravity and protostellar evolution ...
FRAC TRIVIA I QUIZ - Flint River Astronomy Club
... 6. (8 pts.). Name eight Messier objects that are bright enough to be seen without binoculars or a telescope from a dark site in, say, Arizona. 7. (6 pts.). Three Messier objects are referred to as “Pinwheel Galaxy.” What are they, and what constellations are they in? 8. (5 pts.). Name the five types ...
... 6. (8 pts.). Name eight Messier objects that are bright enough to be seen without binoculars or a telescope from a dark site in, say, Arizona. 7. (6 pts.). Three Messier objects are referred to as “Pinwheel Galaxy.” What are they, and what constellations are they in? 8. (5 pts.). Name the five types ...
_____ 1. Which of the following statements is NOT true about stars
... ___________________ once it has used up all of its hydrogen. The center of the star will _________________ as the atmosphere begins to grow large. The mass of the star will determine if it will be a red giant or a supergiant. 11. What is the difference between a red giant and a supergiant? _________ ...
... ___________________ once it has used up all of its hydrogen. The center of the star will _________________ as the atmosphere begins to grow large. The mass of the star will determine if it will be a red giant or a supergiant. 11. What is the difference between a red giant and a supergiant? _________ ...
Theoretical Examination
... 852 kg. It was initially placed in an elliptical orbit around the Earth with perigee at a height of 264.1 km and apogee at a height of 23903.6 km, above the surface of the Earth. After raising the orbit six times, MOM was transferred to a trans-Mars injection orbit (Hohmann orbit). The first such or ...
... 852 kg. It was initially placed in an elliptical orbit around the Earth with perigee at a height of 264.1 km and apogee at a height of 23903.6 km, above the surface of the Earth. After raising the orbit six times, MOM was transferred to a trans-Mars injection orbit (Hohmann orbit). The first such or ...
Section 1 Notes on Stars
... 5. When a star forms, why does it end up with only a fraction of the available matter? 6. What do star clusters tell us about the formation of stars? 7. Where in the Galaxy does star formation take place? 8. How can the death of one star trigger the birth of many other stars? ...
... 5. When a star forms, why does it end up with only a fraction of the available matter? 6. What do star clusters tell us about the formation of stars? 7. Where in the Galaxy does star formation take place? 8. How can the death of one star trigger the birth of many other stars? ...
Recurring theme: conservation of energy
... How Big Can Stars Get? • As stars start to collapse, their winds blow off their outer layers ...
... How Big Can Stars Get? • As stars start to collapse, their winds blow off their outer layers ...
Unit 60 to 79
... b. Exceed its Chandrasekhar limit c. Have begun life as a high-mass star d. Continue the fusion cycle until its core is completely composed of iron 7) Which of the following events will not leave any remnant? a. Type I supernova b. Type II supernova c. Nova 8) The Sun will likely never become a nova ...
... b. Exceed its Chandrasekhar limit c. Have begun life as a high-mass star d. Continue the fusion cycle until its core is completely composed of iron 7) Which of the following events will not leave any remnant? a. Type I supernova b. Type II supernova c. Nova 8) The Sun will likely never become a nova ...
Introduction - University of Iowa Astrophysics
... usually referred to as X-rays • Gamma-rays typically have energies above about 100 keV ...
... usually referred to as X-rays • Gamma-rays typically have energies above about 100 keV ...
Sections F and G
... These are almost certainly too massive to be neutron stars so are presumably black holes surrounded by accretion discs. In General Relativity, around any mass M there is an ‘event horizon’ from within which no matter or radiation can escape. This has the Schwarzschild radius Rs= (2GM)/c2 (In a simpl ...
... These are almost certainly too massive to be neutron stars so are presumably black holes surrounded by accretion discs. In General Relativity, around any mass M there is an ‘event horizon’ from within which no matter or radiation can escape. This has the Schwarzschild radius Rs= (2GM)/c2 (In a simpl ...
PROBLEM SET #9 SOLUTIONS AST142 1. Quasar luminosity
... This is only 22 AU. The X-ray variability suggests the accretion region is less than this size . If the central black hole is accreting and producing luminosity at the Eddington rate, its mass is 2e4 L = 2 × 1042 g = 109 M M= 3Gmp m2e c5 The Schwarzschild radius for a billion solar mass black hole ...
... This is only 22 AU. The X-ray variability suggests the accretion region is less than this size . If the central black hole is accreting and producing luminosity at the Eddington rate, its mass is 2e4 L = 2 × 1042 g = 109 M M= 3Gmp m2e c5 The Schwarzschild radius for a billion solar mass black hole ...
Chapter 13
... low mass; during this period, they blow off material at supersonic speeds. 6. Astronomers calculate that a star with a mass greater than 100 solar masses will emit radiation so intense that it will prevent more material from falling into the star, thereby limiting the star’s size. 7. Protostars with ...
... low mass; during this period, they blow off material at supersonic speeds. 6. Astronomers calculate that a star with a mass greater than 100 solar masses will emit radiation so intense that it will prevent more material from falling into the star, thereby limiting the star’s size. 7. Protostars with ...
Document
... neutron. The neutrons, however, can often stop the collapse and remain as a neutron star. • Neutron stars are fascinating objects because they are the most dense objects known. They are only about 10 miles in diameter, yet they are more massive than the Sun. One sugar cube of neutron star material w ...
... neutron. The neutrons, however, can often stop the collapse and remain as a neutron star. • Neutron stars are fascinating objects because they are the most dense objects known. They are only about 10 miles in diameter, yet they are more massive than the Sun. One sugar cube of neutron star material w ...