MSci Astrophysics 210PHY412 - Queen's University Belfast
... The existence of a superwind is suggested by two independent variables. The high density observed within the observed shells in stellar ejecta, and relative paucity of very bright stars on the AGB. The latter (Prialnik P. 161) comes from the number of AGB stars expected compared to observed is >10. ...
... The existence of a superwind is suggested by two independent variables. The high density observed within the observed shells in stellar ejecta, and relative paucity of very bright stars on the AGB. The latter (Prialnik P. 161) comes from the number of AGB stars expected compared to observed is >10. ...
L10 - QUB Astrophysics Research Centre
... The existence of a superwind is suggested by two independent variables. The high density observed within the observed shells in stellar ejecta, and relative paucity of very bright stars on the AGB. The latter (Prialnik P. 161) comes from the number of AGB stars expected compared to observed is >10. ...
... The existence of a superwind is suggested by two independent variables. The high density observed within the observed shells in stellar ejecta, and relative paucity of very bright stars on the AGB. The latter (Prialnik P. 161) comes from the number of AGB stars expected compared to observed is >10. ...
Stellar Evolution Simulation
... Stellar Evolution Simulation In this activity, you will be tracing the lifecycle of several different types of stars. First, go onto http://www.planetseed.com/laboratory/virtual-experiment-build-your-own-star. You will want to keep this website open as it lists some terms that you might not be famil ...
... Stellar Evolution Simulation In this activity, you will be tracing the lifecycle of several different types of stars. First, go onto http://www.planetseed.com/laboratory/virtual-experiment-build-your-own-star. You will want to keep this website open as it lists some terms that you might not be famil ...
Spectroscopy, the Doppler Shift and Masses of Binary Stars
... • It is not so difficult to build big radio telescopes • The earth ...
... • It is not so difficult to build big radio telescopes • The earth ...
Lecture14
... • Late evolution and death of intermediate-mass stars (about 0.4 M to about 4 M): – red giant when shell hydrogen fusion begins, – a horizontal-branch star when core helium fusion begins – asymptotic giant branch star when the no more helium core fusion and shell helium fusion begins. – Then alf o ...
... • Late evolution and death of intermediate-mass stars (about 0.4 M to about 4 M): – red giant when shell hydrogen fusion begins, – a horizontal-branch star when core helium fusion begins – asymptotic giant branch star when the no more helium core fusion and shell helium fusion begins. – Then alf o ...
Dark matter in the Galactic Halo Rotation curve (i.e. the orbital
... • observations of dark matter in galaxy clusters suggest there is too much dark matter for it all to be baryons, must be largely non-baryonic. On galaxy scales no such simple argument exists. Individual types of dark matter can be constrained using various indirect arguments, but only direct probe i ...
... • observations of dark matter in galaxy clusters suggest there is too much dark matter for it all to be baryons, must be largely non-baryonic. On galaxy scales no such simple argument exists. Individual types of dark matter can be constrained using various indirect arguments, but only direct probe i ...
Problem Set No. 5
... no stars of lower mass would have had time to become white dwarfs, even if they formed just after the big bang. 9. The coolest stars at the centers of planetary nebulae are about 25,000 K. Why don’t astronomers see planetary nebulae with cooler central stars? (Hint: What kind of photons excite the g ...
... no stars of lower mass would have had time to become white dwarfs, even if they formed just after the big bang. 9. The coolest stars at the centers of planetary nebulae are about 25,000 K. Why don’t astronomers see planetary nebulae with cooler central stars? (Hint: What kind of photons excite the g ...
Space The Life of a Star
... and it is colored white. Once it cools down further, the star becomes a black dwarf. Now, the star is finished with its life cycle. High-mass stars explode after their red giant stage. If the star is massive enough, it will eventually become a black hole. Other high-mass red giants may become neutro ...
... and it is colored white. Once it cools down further, the star becomes a black dwarf. Now, the star is finished with its life cycle. High-mass stars explode after their red giant stage. If the star is massive enough, it will eventually become a black hole. Other high-mass red giants may become neutro ...
c - Fsusd
... 4) The planets and moons in our solar system are visible because they ______. a) emit their own light b) undergo nuclear fusion c) absorb light from the sun d) reflect light from the sun ...
... 4) The planets and moons in our solar system are visible because they ______. a) emit their own light b) undergo nuclear fusion c) absorb light from the sun d) reflect light from the sun ...
MSci Astrophysics 210PHY412 - Queen's University Belfast
... Heat is convected by rising elements which are hotter than their surroundings and falling elements which are cooler. Suppose the element differs by T from its surroundings, because an element is always in pressure balance with its surroundings, it has energy content per kg which differs from surrou ...
... Heat is convected by rising elements which are hotter than their surroundings and falling elements which are cooler. Suppose the element differs by T from its surroundings, because an element is always in pressure balance with its surroundings, it has energy content per kg which differs from surrou ...
r - QUB Astrophysics Research Centre
... Heat is convected by rising elements which are hotter than their surroundings and falling elements which are cooler. Suppose the element differs by T from its surroundings, because an element is always in pressure balance with its surroundings, it has energy content per kg which differs from surrou ...
... Heat is convected by rising elements which are hotter than their surroundings and falling elements which are cooler. Suppose the element differs by T from its surroundings, because an element is always in pressure balance with its surroundings, it has energy content per kg which differs from surrou ...
The Life of a Star
... it cools down further, the star becomes a black dwarf. Now, the star is finished with its life cycle. High-mass stars explode after their red giant stage. If the star is massive enough, it will eventually become a black hole. Other high-mass red giants may become neutron stars. A neutron star is usu ...
... it cools down further, the star becomes a black dwarf. Now, the star is finished with its life cycle. High-mass stars explode after their red giant stage. If the star is massive enough, it will eventually become a black hole. Other high-mass red giants may become neutron stars. A neutron star is usu ...
Maximum Mass Limit of Stars on the Main Sequence
... of these objects. Essentially, there are no conclusive observations that indicate whether a slow or a fast method applies to this type of stellar formation. Regardless of the approach, some of the gas in these filaments can become gravitationally bound and begin the collapse necessary to begin the ...
... of these objects. Essentially, there are no conclusive observations that indicate whether a slow or a fast method applies to this type of stellar formation. Regardless of the approach, some of the gas in these filaments can become gravitationally bound and begin the collapse necessary to begin the ...
Black Hole
... suddenly wondered how Newtonian gravitation would have to be modified to fit in with special relativity. At this point there occurred to Einstein, described by him as the happiest thought of my life , namely that an observer who is falling from the roof of a house experiences no gravitational field. ...
... suddenly wondered how Newtonian gravitation would have to be modified to fit in with special relativity. At this point there occurred to Einstein, described by him as the happiest thought of my life , namely that an observer who is falling from the roof of a house experiences no gravitational field. ...
Question 1 The star Regulus, in the constellation Leo, appears
... . The fact that quasars can be detected from distances from which even the biggest and most luminous galaxies cannot be seen means that ...
... . The fact that quasars can be detected from distances from which even the biggest and most luminous galaxies cannot be seen means that ...
8.3 Stars
... a region of space in which the gravitational field is so powerful that nothing, including light, can escape its pull. The black hole has a one-way surface, called an event horizon, into which objects can fall, but out of which nothing can come (form of death for massive stars) ...
... a region of space in which the gravitational field is so powerful that nothing, including light, can escape its pull. The black hole has a one-way surface, called an event horizon, into which objects can fall, but out of which nothing can come (form of death for massive stars) ...
Structure of Neutron Stars
... Minimal mass In reality, minimal mass is determined by properties of protoNSs. Being hot, lepton rich they have much higher limit: about 0.7 solar mass. Stellar evolution does not produce NSs with barion mass less than about 1.4 solar mass. Fragmentation of a core due to rapid rotation potentially ...
... Minimal mass In reality, minimal mass is determined by properties of protoNSs. Being hot, lepton rich they have much higher limit: about 0.7 solar mass. Stellar evolution does not produce NSs with barion mass less than about 1.4 solar mass. Fragmentation of a core due to rapid rotation potentially ...
Astrophysics
... b) (2 points) Find Rs in parsecs for an O star if Φ=1049 photons/s, n = 10 atoms/cm3 , and α = 2 × 10−13 . c) (2 points) Find Rs in parsecs for the sun if Φ = 5×1023 photons/s, while n and α remain the same. d) (3 points) Could the cloud around the sun be seen by an astronomer on α-Centauri (distanc ...
... b) (2 points) Find Rs in parsecs for an O star if Φ=1049 photons/s, n = 10 atoms/cm3 , and α = 2 × 10−13 . c) (2 points) Find Rs in parsecs for the sun if Φ = 5×1023 photons/s, while n and α remain the same. d) (3 points) Could the cloud around the sun be seen by an astronomer on α-Centauri (distanc ...
Life Cycle of a Star - Intervention Worksheet
... A dying red super giant star can suddenly explode. The explosion is called a supernova. After the star explodes, some of the materials from the star are left behind. This material may form a neutron star. Neutron stars are the remains of massive stars. The most massive stars become black holes when ...
... A dying red super giant star can suddenly explode. The explosion is called a supernova. After the star explodes, some of the materials from the star are left behind. This material may form a neutron star. Neutron stars are the remains of massive stars. The most massive stars become black holes when ...
1) The following questions refer to the HR diagram
... A) it amplifies the contrast with red giants. B) they are both very hot and very small. C) they are supported by electron degeneracy pressure. D) they are the end-products of small, low-mass stars. E) they are the opposite of black holes. 22) What happens to the surface temperature and luminosity wh ...
... A) it amplifies the contrast with red giants. B) they are both very hot and very small. C) they are supported by electron degeneracy pressure. D) they are the end-products of small, low-mass stars. E) they are the opposite of black holes. 22) What happens to the surface temperature and luminosity wh ...
Kerr - ICRANet
... Jerzy Plebansky, a very well-known Polish relativist visits Austin for Christmas. Alfred Schild holds one of his excellent parties for Jerzy. During this I hear them mention their interest in spaces of the Kerr-Schild form (that name had not been invented at that time, of course). ...
... Jerzy Plebansky, a very well-known Polish relativist visits Austin for Christmas. Alfred Schild holds one of his excellent parties for Jerzy. During this I hear them mention their interest in spaces of the Kerr-Schild form (that name had not been invented at that time, of course). ...
Star Gazing
... • Take a picture of the sunset with 30o open region to the right of the sun (spring sunset). Use fist method (arm outstretched) to measure 30o (3 fist lengths) to the right/north of sunset now. • Specific directions on website for what you need to write down. • Turn in the picture with details liste ...
... • Take a picture of the sunset with 30o open region to the right of the sun (spring sunset). Use fist method (arm outstretched) to measure 30o (3 fist lengths) to the right/north of sunset now. • Specific directions on website for what you need to write down. • Turn in the picture with details liste ...
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.