Neutron star - SharpSchool
... Small stars use up their fuel more slowly than large stars, so they have much longer lives Small stars can live up to 200 billion years Medium stars (like the sun) can live for about ...
... Small stars use up their fuel more slowly than large stars, so they have much longer lives Small stars can live up to 200 billion years Medium stars (like the sun) can live for about ...
Life Cycle of a Star worksheet
... Learning Goal: I can describe the life cycle of various types of stars. All stars start as a ______________. A ______________ is a large cloud of gas and dust. Gravity can pull some of the gas and dust in a nebula together. The contracting cloud is then called a ___________. A protostar is the earli ...
... Learning Goal: I can describe the life cycle of various types of stars. All stars start as a ______________. A ______________ is a large cloud of gas and dust. Gravity can pull some of the gas and dust in a nebula together. The contracting cloud is then called a ___________. A protostar is the earli ...
Stellar Evolution - Hays High Indians
... • The death of the largest stars results in a core more dense than anything we know on earth • This core has such a large gravitational force that light cannot escape it. • . . . Hence the name, black hole • Picture here ...
... • The death of the largest stars results in a core more dense than anything we know on earth • This core has such a large gravitational force that light cannot escape it. • . . . Hence the name, black hole • Picture here ...
Stellar Evolution
... Without the outward pressure generated from these reactions to counteract the force of gravity, the outer layers of the star begin to collapse inward. Just as during formation, when the material contracts, the temperature and pressure increase. This newly generated heat temporarily counteracts the f ...
... Without the outward pressure generated from these reactions to counteract the force of gravity, the outer layers of the star begin to collapse inward. Just as during formation, when the material contracts, the temperature and pressure increase. This newly generated heat temporarily counteracts the f ...
Slide 1 - cosmos.esa.int
... positrons, positrons annihilate with electrons producing neutrinos and anti-neutrinos) dominates the cooling at higher entropies. The lepton fraction remains higher and electron degeneracy pressure plays a stronger role at late times. ...
... positrons, positrons annihilate with electrons producing neutrinos and anti-neutrinos) dominates the cooling at higher entropies. The lepton fraction remains higher and electron degeneracy pressure plays a stronger role at late times. ...
Distance and Luminosity (new 2012)
... Because of the Earth's revolution around the Sun, nearby stars appear to move with respect to very distant stars which seem to be standing still. Measure the angle to the star and observe how it changes as the position of the earth changes. In the diagram if the observation point is at the top of th ...
... Because of the Earth's revolution around the Sun, nearby stars appear to move with respect to very distant stars which seem to be standing still. Measure the angle to the star and observe how it changes as the position of the earth changes. In the diagram if the observation point is at the top of th ...
Star Life Cycle
... It is so dense – 1 spoonful of Earth would weigh 100 million tons. Rotates very rapidly. If the star's remaining mass is between 1 1/2 to 3 times the mass of the Sun, it will collapse into a small, dense neutron star (about ten miles in diameter, about 1.4 times the mass of the Sun, with an extr ...
... It is so dense – 1 spoonful of Earth would weigh 100 million tons. Rotates very rapidly. If the star's remaining mass is between 1 1/2 to 3 times the mass of the Sun, it will collapse into a small, dense neutron star (about ten miles in diameter, about 1.4 times the mass of the Sun, with an extr ...
2009 Assessment Schedule (90764)
... When the mass of the protostar is sufficiently high it enables the nuclear fusion of hydrogen into helium and becomes a main sequence star. AND Gravitational collapse explained using one or more causes stated below. Gravitational collapse can be caused by: • giant molecular clouds colliding, • passi ...
... When the mass of the protostar is sufficiently high it enables the nuclear fusion of hydrogen into helium and becomes a main sequence star. AND Gravitational collapse explained using one or more causes stated below. Gravitational collapse can be caused by: • giant molecular clouds colliding, • passi ...
Stellar Evolution
... becomes faster than light. Light itself cannot escape…. A Black Hole. The distance from the star called the Event Horizon is where escape velocity is equal to light-speed. Any closer and nothing can escape! Black holes are detected by the infrared and X-ray light produced by the whirlpool material f ...
... becomes faster than light. Light itself cannot escape…. A Black Hole. The distance from the star called the Event Horizon is where escape velocity is equal to light-speed. Any closer and nothing can escape! Black holes are detected by the infrared and X-ray light produced by the whirlpool material f ...
Life Cycle of Stars
... If the remnant of the explosion is 1.4 to about 3 times as massive as our Sun, it will become a neutron star. ...
... If the remnant of the explosion is 1.4 to about 3 times as massive as our Sun, it will become a neutron star. ...
スライド 1 - Astrophyics Lab. in Kagoshima University
... – developing new technique – implication to new possibility ...
... – developing new technique – implication to new possibility ...
A Star is Born – Worksheet and Key – Ben Kwok
... Are white dwarfs very hot or very cold? What comes after a white dwarf? What is a supergiant star? Is the lifespan of a supergiant longer or shorter than that of a main sequence? 13. How big can a supergiant get? 14. What are 2 characteristics of a neutron star? 15. How many black holes have been fo ...
... Are white dwarfs very hot or very cold? What comes after a white dwarf? What is a supergiant star? Is the lifespan of a supergiant longer or shorter than that of a main sequence? 13. How big can a supergiant get? 14. What are 2 characteristics of a neutron star? 15. How many black holes have been fo ...
chapter10
... produce more energy than needed for pressure support Expansion and cooling of the outer layers of the star ...
... produce more energy than needed for pressure support Expansion and cooling of the outer layers of the star ...
review
... Question 3 • The fastest pulsars, called millisecond pulsars, have periods of about 1/1000 second. The reason they pulse so much faster than (for example) the Crab and Vela pulsars is that they • A. were formed from much more massive stars than were the Crab and Vela pulsars, and were spun up more ...
... Question 3 • The fastest pulsars, called millisecond pulsars, have periods of about 1/1000 second. The reason they pulse so much faster than (for example) the Crab and Vela pulsars is that they • A. were formed from much more massive stars than were the Crab and Vela pulsars, and were spun up more ...
Stellar Evolution
... 6. Energy is exhausted! -Planetary Nebulas form… a cloud of gas that forms around a sun-like star that is dying. -White dwarfs – As the planetary nebula disperses, gravity causes the remaining matter to collapse inward…what is left is hot & dense…it is called a white dwarf. -When a white dwarf no lo ...
... 6. Energy is exhausted! -Planetary Nebulas form… a cloud of gas that forms around a sun-like star that is dying. -White dwarfs – As the planetary nebula disperses, gravity causes the remaining matter to collapse inward…what is left is hot & dense…it is called a white dwarf. -When a white dwarf no lo ...
Astronomy
... The outer layers of the star grow bigger and slowly drift out into space. This material rejoins a nebula to be recycled into a new star The blue-white hot core is left and the “dead” star that is left behind is a white dwarf The glow coming from the core is left-over energy from the old star. The co ...
... The outer layers of the star grow bigger and slowly drift out into space. This material rejoins a nebula to be recycled into a new star The blue-white hot core is left and the “dead” star that is left behind is a white dwarf The glow coming from the core is left-over energy from the old star. The co ...
Practice Questions for Final
... B. A spaceship passing near a 10 solar mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10 solar mass mainsequence star. C. If you watch someone else fall into a black hole, you will never see them cross the event horizon. However ...
... B. A spaceship passing near a 10 solar mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10 solar mass mainsequence star. C. If you watch someone else fall into a black hole, you will never see them cross the event horizon. However ...
Chapter 16
... that can be supported by electron degeneracy pressure - and that mass corresponds to 1.4 M Any more mass than 1.4 M will cause further collapse until Neutron degeneracy is reached, leading to a neutron star. A Neutron star is essentially a giant iron nucleus comprised of protons and degenerate neu ...
... that can be supported by electron degeneracy pressure - and that mass corresponds to 1.4 M Any more mass than 1.4 M will cause further collapse until Neutron degeneracy is reached, leading to a neutron star. A Neutron star is essentially a giant iron nucleus comprised of protons and degenerate neu ...
Stellar Evolution after the Main Sequence
... brief seconds of the Supernova explosion when there is more than enough energy ...
... brief seconds of the Supernova explosion when there is more than enough energy ...
chap17_f03_phints
... A star is determined to have a surface temperature twice that of the Sun, and a luminosity 64X greater. What is this star’s radius, expressed in solar units ? HINT: Problem 4 is an application of the radius – luminosity – temperature relation for stars. Given two of these values, the third is found ...
... A star is determined to have a surface temperature twice that of the Sun, and a luminosity 64X greater. What is this star’s radius, expressed in solar units ? HINT: Problem 4 is an application of the radius – luminosity – temperature relation for stars. Given two of these values, the third is found ...
1117 Discussion Notes
... We can, in theory, do similar calculations for stars that are closer to the edge of the disk to find the mass of a greater portion of the galaxy. Since the bulge looks so big and bright, we expect that most of the mass of the galaxy is located in the center. However, in order for this to be true the ...
... We can, in theory, do similar calculations for stars that are closer to the edge of the disk to find the mass of a greater portion of the galaxy. Since the bulge looks so big and bright, we expect that most of the mass of the galaxy is located in the center. However, in order for this to be true the ...
1. a. Collisionless Boltzmann—particles moving in smooth potential
... Usually also applied when system has reached near steady state so system is time-independent. b. Collisionless Boltzmann model implies structure of 6-dimensional phase space. Studies require knowing (x,y,z) of star thus distance and location in 3-space as well as all 3 velocity components. This kind ...
... Usually also applied when system has reached near steady state so system is time-independent. b. Collisionless Boltzmann model implies structure of 6-dimensional phase space. Studies require knowing (x,y,z) of star thus distance and location in 3-space as well as all 3 velocity components. This kind ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.