Chapter 13 - USD Home Pages
... supernovae are “identical,” so this is a “standard candle” and its distance can be determined via the formula B = L/4πD 2 , where B is the apparent brightness. The ability to measure vast distances is crucial to understanding the universe. 23. What prevents thermonuclear fusion from occurring at the ...
... supernovae are “identical,” so this is a “standard candle” and its distance can be determined via the formula B = L/4πD 2 , where B is the apparent brightness. The ability to measure vast distances is crucial to understanding the universe. 23. What prevents thermonuclear fusion from occurring at the ...
Compact Extragalactic Star Formation
... • Thanks to Kelsey Johnson for supplying several viewgraphs! ...
... • Thanks to Kelsey Johnson for supplying several viewgraphs! ...
Sample Exam 2
... 10. Late in its evolution, the Sun will become a white dwarf with a radius about 100 times smaller than its current radius. The volume of the Sun today is approximately ______ times larger than its future volume. A. 100 B. 103 C. 104 D. 106 E. 108 11. What kind of celestial observation would be best ...
... 10. Late in its evolution, the Sun will become a white dwarf with a radius about 100 times smaller than its current radius. The volume of the Sun today is approximately ______ times larger than its future volume. A. 100 B. 103 C. 104 D. 106 E. 108 11. What kind of celestial observation would be best ...
Instrumentation for Cosmology
... Just strings of stars? No, because they would be tightly wound up. Suppose the age of the galaxy is 10 billion years. Its inner regions rotate once in 200 million years… Therefore, we’d expect about 50 turns. The galaxy would look like a clock spring. ...
... Just strings of stars? No, because they would be tightly wound up. Suppose the age of the galaxy is 10 billion years. Its inner regions rotate once in 200 million years… Therefore, we’d expect about 50 turns. The galaxy would look like a clock spring. ...
Objects Beyond our Solar System
... black dwarf…this has yet to happen as it is estimated to take longer than the known age of the universe, 13.8 billion years. ...
... black dwarf…this has yet to happen as it is estimated to take longer than the known age of the universe, 13.8 billion years. ...
Folie 1
... • Bigger star becomes a white dwarf • Smaller star eventually becomes a red giant • Once smaller star fills its Roche limit, it transfers mass to the white dwarf – if both are low mass, two white dwarfs are formed – if more mass is present, more interesting stuff happens… ...
... • Bigger star becomes a white dwarf • Smaller star eventually becomes a red giant • Once smaller star fills its Roche limit, it transfers mass to the white dwarf – if both are low mass, two white dwarfs are formed – if more mass is present, more interesting stuff happens… ...
Unit 2: The Sun and Other Stars
... by the star (which we call a supernova). While scientists still don’t completely understand the process, the collision of neutron stars and supernova explosions appear to be the “creators” of the heavier elements. ...
... by the star (which we call a supernova). While scientists still don’t completely understand the process, the collision of neutron stars and supernova explosions appear to be the “creators” of the heavier elements. ...
Read the article - UMass Dartmouth
... Gravitational waves, on the other hand, go through anything very freely. That’s what makes them so hard to detect but also what makes them amazing sources of information, says Fisher. The actual process of the two-second explosion would be “right there in the gravitational wave.” The team looked at ...
... Gravitational waves, on the other hand, go through anything very freely. That’s what makes them so hard to detect but also what makes them amazing sources of information, says Fisher. The actual process of the two-second explosion would be “right there in the gravitational wave.” The team looked at ...
PowerPoint Presentation - Research in observational
... Type Ia,b,c have strong silicon, strong helium and weak silicon, respectively. Type II, Ib, Ic derive from massive star collapse – they occur in elliptical galaxies (which host younger populations) in proximity to HII regions. They have intermediate type elements from the many stages of nuclear burn ...
... Type Ia,b,c have strong silicon, strong helium and weak silicon, respectively. Type II, Ib, Ic derive from massive star collapse – they occur in elliptical galaxies (which host younger populations) in proximity to HII regions. They have intermediate type elements from the many stages of nuclear burn ...
The Life of a Star
... does not permit its atoms to fuse into heavier elements) and fusion ceases. In less than a second, the star begins gravitational collapse, the core temperature rises to over 100 billion degrees, and the iron atoms are crushed together o The repulsive force between the nuclei overcomes the force of ...
... does not permit its atoms to fuse into heavier elements) and fusion ceases. In less than a second, the star begins gravitational collapse, the core temperature rises to over 100 billion degrees, and the iron atoms are crushed together o The repulsive force between the nuclei overcomes the force of ...
Ivelina Sotirova Major: Biochemistry Senior at CUNY Hunter College
... [1]. Thus, the idea that the expansion of the Universe could be measured by using supernovae as standard candles was the very stepping stone for SCP and HZT’s groundbreaking research. Finding SNe Ia however, seemed like a hard task in the early 1980s. Distant supernovae could not be easily identifie ...
... [1]. Thus, the idea that the expansion of the Universe could be measured by using supernovae as standard candles was the very stepping stone for SCP and HZT’s groundbreaking research. Finding SNe Ia however, seemed like a hard task in the early 1980s. Distant supernovae could not be easily identifie ...
Stellar Evolution
... taken. They form about the same way, only hydrogen is used up faster, because they are so bright. These massive stars become red giants many times, each time it uses up a new layer of gases by fusing different elements together. ...
... taken. They form about the same way, only hydrogen is used up faster, because they are so bright. These massive stars become red giants many times, each time it uses up a new layer of gases by fusing different elements together. ...
White dwarfs & supernovae — Oct 19 white dwarfs?
... 1. Plot shows the speed of a normal gas made of electrons with a temperature of 1000K and a degenerate gas of electrons with a temperature of 0K. A. I is a NG. II is a DG. B. I is a DG. II is a NG. ...
... 1. Plot shows the speed of a normal gas made of electrons with a temperature of 1000K and a degenerate gas of electrons with a temperature of 0K. A. I is a NG. II is a DG. B. I is a DG. II is a NG. ...
Astronomy 12: Introduction to Astronomy
... c. The separation of the hydrogen envelope to form a planetary nebula. d. The formation of helium by fusing hydrogen together. 4. When a star’s gravitational force pulling inwards and its internal pressure pushing outward are balanced, it is considered to be in what? a. Hydrostatic equilibrium b. Su ...
... c. The separation of the hydrogen envelope to form a planetary nebula. d. The formation of helium by fusing hydrogen together. 4. When a star’s gravitational force pulling inwards and its internal pressure pushing outward are balanced, it is considered to be in what? a. Hydrostatic equilibrium b. Su ...
Star Factories: Nuclear Fusion and the Creation of the Elements
... The R-Process When the supernova explodes, large numbers of neutrons are shot out of the interior of the star at high velocities. Think of these like pellets in a shot gun shell that has been fired. These neutrons pass through the outer regions of the star, colliding with the atoms already there (m ...
... The R-Process When the supernova explodes, large numbers of neutrons are shot out of the interior of the star at high velocities. Think of these like pellets in a shot gun shell that has been fired. These neutrons pass through the outer regions of the star, colliding with the atoms already there (m ...
Document
... • A sub-Chandrasekhar white dwarf • A less dense companion star 2. Gravity strips material off companion star 3. Dwarf gets more and more massive 4. Mass exceeds Chandrasekhar limit (1.4 Msun) 5. Kablooey 6. Kablooey has a certain absolute magnitude 7. Kablooey is very very bright. 8. Use apparent/a ...
... • A sub-Chandrasekhar white dwarf • A less dense companion star 2. Gravity strips material off companion star 3. Dwarf gets more and more massive 4. Mass exceeds Chandrasekhar limit (1.4 Msun) 5. Kablooey 6. Kablooey has a certain absolute magnitude 7. Kablooey is very very bright. 8. Use apparent/a ...
Astronomy 2
... Each star is represented by a dot. One uses data from lots of stars, so there are lots of dots. The position of each dot on the diagram corresponds to the star's luminosity and its temperature The vertical position represents the star's luminosity (absolute magnitude). The horizontal position re ...
... Each star is represented by a dot. One uses data from lots of stars, so there are lots of dots. The position of each dot on the diagram corresponds to the star's luminosity and its temperature The vertical position represents the star's luminosity (absolute magnitude). The horizontal position re ...
STUDY GUIDE FOR CHAPTER 1
... A. They go through first red giant, helium burning in the core, and double shell burning phases. B. Then they go through a sequence of situations where the core is contracting and heating up when no fusion is going on inside it and then stops contracting when the next type of fusion begins. Meanwhil ...
... A. They go through first red giant, helium burning in the core, and double shell burning phases. B. Then they go through a sequence of situations where the core is contracting and heating up when no fusion is going on inside it and then stops contracting when the next type of fusion begins. Meanwhil ...
Universe 8e Lecture Chapter 17 Nature of Stars
... star increases suddenly by a factor of around 108 during this explosion, producing a supernova. ...
... star increases suddenly by a factor of around 108 during this explosion, producing a supernova. ...
Universe 8e Lecture Chapter 17 Nature of Stars
... star increases suddenly by a factor of around 108 during this explosion, producing a supernova. ...
... star increases suddenly by a factor of around 108 during this explosion, producing a supernova. ...
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.