Astronomy 2
... brightest are ≤ 1 faintest are ≥ 6 absolute magnitude – expresses luminosity of stars as if they were all seen 32.6 lightyears from Earth (our sun = 4.8) ...
... brightest are ≤ 1 faintest are ≥ 6 absolute magnitude – expresses luminosity of stars as if they were all seen 32.6 lightyears from Earth (our sun = 4.8) ...
glossary - Discovery Education
... the origin and evolution of the universe. dark matter — matter that cannot be detected with current technology. It is too cold and dark to see or measure; scientists believe it makes up about 90 percent of the universe. fusion — a nuclear reaction in the center of a star that releases a tremendous a ...
... the origin and evolution of the universe. dark matter — matter that cannot be detected with current technology. It is too cold and dark to see or measure; scientists believe it makes up about 90 percent of the universe. fusion — a nuclear reaction in the center of a star that releases a tremendous a ...
Contents of the Universe
... • Core collapse stops, neutron star is formed • Rest of the star collapses in on the core, but bounces off the new neutron star (also pushed outwards by the neutrinos) ...
... • Core collapse stops, neutron star is formed • Rest of the star collapses in on the core, but bounces off the new neutron star (also pushed outwards by the neutrinos) ...
Life Cycle of Stars Flipbook Assignment
... 6. What is going to happen to our Sun’s magnitude and temperature when it goes to its next stage? 7. What is the final stage of our Sun’s life? 8. What will happen to our Sun’s magnitude and temperature when it goes to its final stage? 9. What determines which star will go supernova? 10. What two fo ...
... 6. What is going to happen to our Sun’s magnitude and temperature when it goes to its next stage? 7. What is the final stage of our Sun’s life? 8. What will happen to our Sun’s magnitude and temperature when it goes to its final stage? 9. What determines which star will go supernova? 10. What two fo ...
File
... oxygen ashes behind. • Now there are two burning shells, helium and hydrogen. • Again the atmosphere expands and the star becomes a red giant for the second time. ...
... oxygen ashes behind. • Now there are two burning shells, helium and hydrogen. • Again the atmosphere expands and the star becomes a red giant for the second time. ...
wk9 (part 1)
... • Luminosity classes in an HR diagram (I through V) are based on the evolutionary phase of a star — whether it is a dwarf, subgiant, giant, or supergiant • Main sequence → Subgiant/Red giant: From burning hydrogen in the core to burning hydrogen in a shell that surrounds an inert (i.e., non-burning) ...
... • Luminosity classes in an HR diagram (I through V) are based on the evolutionary phase of a star — whether it is a dwarf, subgiant, giant, or supergiant • Main sequence → Subgiant/Red giant: From burning hydrogen in the core to burning hydrogen in a shell that surrounds an inert (i.e., non-burning) ...
Round 1
... An ’HR diagram’ is a plot of which two quantities. (T (or spectral type) vs. L (or absolute magnitude)) $1200 More luminous stars tend to live this. (shorter lives) $1600 This tells you how much energy is released in the fusion of hydrogen to helium. (E = ∆mc2 where ∆m is the mass difference between ...
... An ’HR diagram’ is a plot of which two quantities. (T (or spectral type) vs. L (or absolute magnitude)) $1200 More luminous stars tend to live this. (shorter lives) $1600 This tells you how much energy is released in the fusion of hydrogen to helium. (E = ∆mc2 where ∆m is the mass difference between ...
Prep Homework Solutions for HW due 10/04/10
... 1) The Algol system seems odd because the lower-mass star seems to be the more evolved star, but normally we think of binaries as stars born together and we expect higher-mass stars to evolve faster. The resolution of the paradox is presumed to be that the red giant in Algol used to be the more mass ...
... 1) The Algol system seems odd because the lower-mass star seems to be the more evolved star, but normally we think of binaries as stars born together and we expect higher-mass stars to evolve faster. The resolution of the paradox is presumed to be that the red giant in Algol used to be the more mass ...
ISP 205 Review Questions, Week 10
... So the more luminous star must have 10,000 times more surface area than the less luminous star. Surface area of a sphere = D2 (where D is the diameter). So the diameter must be ...
... So the more luminous star must have 10,000 times more surface area than the less luminous star. Surface area of a sphere = D2 (where D is the diameter). So the diameter must be ...
Science Olympiad - Department of Physics and Astronomy
... There are two types of magnitudes: Apparent: magnitude of the star determined by how bright it appears from the earth Absolute: magnitude of the star determined by how bright it appears from 10 parsec away ...
... There are two types of magnitudes: Apparent: magnitude of the star determined by how bright it appears from the earth Absolute: magnitude of the star determined by how bright it appears from 10 parsec away ...
Stellar Nucleosynthesis
... • For massive (more than ten solar masses, > 10 MSun) stars, direct nuclear burning continues with the production of oxygen, neon, magnesium, silicon and so on, cumulating in the synthesis of iron, the heaviest element possible through direct nuclear burning. • The other heavy elements, from yttrium ...
... • For massive (more than ten solar masses, > 10 MSun) stars, direct nuclear burning continues with the production of oxygen, neon, magnesium, silicon and so on, cumulating in the synthesis of iron, the heaviest element possible through direct nuclear burning. • The other heavy elements, from yttrium ...
HOMEWORK 5 SOLUTIONS CHAPTER 9 4.A A red giant star will
... the Earth to be a point source. The black hole will also appear to be a point source so the orbit will not change. CHAPTER 11 1.C The halo is home to old, metal-poor stars. Globular clusters contain some of the oldest stars in the Milky Way; they may have been the precursors to the Milky Way itself. ...
... the Earth to be a point source. The black hole will also appear to be a point source so the orbit will not change. CHAPTER 11 1.C The halo is home to old, metal-poor stars. Globular clusters contain some of the oldest stars in the Milky Way; they may have been the precursors to the Milky Way itself. ...
Lives and Deaths of Stars (middle school)
... Outer layers expand due to radiation pressure from a hot core • Surface temperature drops by a factor of ~ 2 • The radius increases by a factor of ~ 100 ...
... Outer layers expand due to radiation pressure from a hot core • Surface temperature drops by a factor of ~ 2 • The radius increases by a factor of ~ 100 ...
The Hertzsprung – Russell Diagram
... Very bright, red in color, very large, cool in temperature Brightness of stars are due to their enormous size ...
... Very bright, red in color, very large, cool in temperature Brightness of stars are due to their enormous size ...
What is a Star
... What is a Star? A star is a luminous globe of glowing gas producing its own heat and light by nuclear reactions in the star's core. Stars vary in size, mass, brightness, temperature and colour. The smallest mass possible for a star is about 1/10 that of the Sun, while the brightest stars have masses ...
... What is a Star? A star is a luminous globe of glowing gas producing its own heat and light by nuclear reactions in the star's core. Stars vary in size, mass, brightness, temperature and colour. The smallest mass possible for a star is about 1/10 that of the Sun, while the brightest stars have masses ...
File
... • For stars that are part of a binary system or star cluster- NO (on next slide) • The white dwarf is the dense core left behind from the previous red giant. • 1 tsp. of white dwarf matter would have a mass of several tons. • This will continue to shine for billions of years. ...
... • For stars that are part of a binary system or star cluster- NO (on next slide) • The white dwarf is the dense core left behind from the previous red giant. • 1 tsp. of white dwarf matter would have a mass of several tons. • This will continue to shine for billions of years. ...
Chapter 28.3 Topic questions
... 11. Red Super Giant stars have surface temperatures that are cooler than our earth, so why do they have greater luminosity than the sun? 12. The H-R diagram also includes which stars that are near the end of their life, what are these stars called? 13. A star begins it life in a cloud of gas and dus ...
... 11. Red Super Giant stars have surface temperatures that are cooler than our earth, so why do they have greater luminosity than the sun? 12. The H-R diagram also includes which stars that are near the end of their life, what are these stars called? 13. A star begins it life in a cloud of gas and dus ...
Stellar Evolution Diagram Answer Key:
... spin rapidly and flattens into a disk shape. Protostar: A protostars lifetime is only a few years. As the nebula shrinks a central mass will collect towards the center. It heats up because of the collision of particles and the increase in pressure. A protostar becomes a main sequence star when it re ...
... spin rapidly and flattens into a disk shape. Protostar: A protostars lifetime is only a few years. As the nebula shrinks a central mass will collect towards the center. It heats up because of the collision of particles and the increase in pressure. A protostar becomes a main sequence star when it re ...
Homework, November 16, 2006 AST110-6
... that it took a few billion years for humans to evolve on Earth, it seems unlikely that advanced life would have had time to evolve around a star that is only a few million years old. For each of the following stars, decide whether you think it is possible that it could harbor an advanced civilizatio ...
... that it took a few billion years for humans to evolve on Earth, it seems unlikely that advanced life would have had time to evolve around a star that is only a few million years old. For each of the following stars, decide whether you think it is possible that it could harbor an advanced civilizatio ...
G030485-00 - DCC
... • Once formed, a star is powered by nuclear burning • Hydrogen and then Helium fuse togetherproducing energy (light and heat) and forming heavier elements ...
... • Once formed, a star is powered by nuclear burning • Hydrogen and then Helium fuse togetherproducing energy (light and heat) and forming heavier elements ...
Unit 1
... Formation of Heavy Elements • Hydrogen and a little helium were formed shortly after the Big Bang • All other elements were formed inside stars! • Low-mass stars create carbon and oxygen in their cores at the end of their lifespan, thanks to the higher temperatures and pressures present in a red gi ...
... Formation of Heavy Elements • Hydrogen and a little helium were formed shortly after the Big Bang • All other elements were formed inside stars! • Low-mass stars create carbon and oxygen in their cores at the end of their lifespan, thanks to the higher temperatures and pressures present in a red gi ...
Stellar Evolution
... A star with 3x the sun’s mass or more has enough mass so that when it collapses the gravitational field becomes so strong that the escape velocity near it becomes faster than light. Light itself cannot escape…. A Black Hole. The distance from the star called the Event Horizon is where escape velocit ...
... A star with 3x the sun’s mass or more has enough mass so that when it collapses the gravitational field becomes so strong that the escape velocity near it becomes faster than light. Light itself cannot escape…. A Black Hole. The distance from the star called the Event Horizon is where escape velocit ...
Life cycle of a star
... – Stars are born in nebulae. – Nebulae are huge clouds of dust and gas – Protostars (young stars) are formed when the dust and gas collapse (come together and become a dense “ball”) as gravitational ...
... – Stars are born in nebulae. – Nebulae are huge clouds of dust and gas – Protostars (young stars) are formed when the dust and gas collapse (come together and become a dense “ball”) as gravitational ...
Stellar evolution
Stellar evolution is the process by which a star changes during its lifetime. Depending on the mass of the star, this lifetime ranges from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. The table shows the lifetimes of stars as a function of their masses. All stars are born from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-sequence star.Nuclear fusion powers a star for most of its life. Initially the energy is generated by the fusion of hydrogen atoms at the core of the main-sequence star. Later, as the preponderance of atoms at the core becomes helium, stars like the Sun begin to fuse hydrogen along a spherical shell surrounding the core. This process causes the star to gradually grow in size, passing through the subgiant stage until it reaches the red giant phase. Stars with at least half the mass of the Sun can also begin to generate energy through the fusion of helium at their core, whereas more-massive stars can fuse heavier elements along a series of concentric shells. Once a star like the Sun has exhausted its nuclear fuel, its core collapses into a dense white dwarf and the outer layers are expelled as a planetary nebula. Stars with around ten or more times the mass of the Sun can explode in a supernova as their inert iron cores collapse into an extremely dense neutron star or black hole. Although the universe is not old enough for any of the smallest red dwarfs to have reached the end of their lives, stellar models suggest they will slowly become brighter and hotter before running out of hydrogen fuel and becoming low-mass white dwarfs.Stellar evolution is not studied by observing the life of a single star, as most stellar changes occur too slowly to be detected, even over many centuries. Instead, astrophysicists come to understand how stars evolve by observing numerous stars at various points in their lifetime, and by simulating stellar structure using computer models.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.