PHYSICS 015
... The temperature rises, and finally reaches 108 (one hundred million) degrees. This ignites “triple-alpha burning.” As in the p-p cycle, the fusion takes place in a series of steps. The net result is that helium nuclei are converted principally to carbon (also oxygen), with a net release of energy. ...
... The temperature rises, and finally reaches 108 (one hundred million) degrees. This ignites “triple-alpha burning.” As in the p-p cycle, the fusion takes place in a series of steps. The net result is that helium nuclei are converted principally to carbon (also oxygen), with a net release of energy. ...
AY 12 Homework #4 Solutions Winter 2016 Longer Problems 1. a
... b) Stars with mass below 0.5 M are not massive enough to ignite helium burning in their cores. These light stars will eventually evolve into helium core white dwarfs. In addition, these stars are fully convective throughout their interiors. c) White dwarfs below 1.44 M are stable (degeneracy press ...
... b) Stars with mass below 0.5 M are not massive enough to ignite helium burning in their cores. These light stars will eventually evolve into helium core white dwarfs. In addition, these stars are fully convective throughout their interiors. c) White dwarfs below 1.44 M are stable (degeneracy press ...
Stellar evolution - Chandra X
... where gas has been heated to very high temperatures or particles have been accelerated to extremely high energies. These conditions can exist near collapsed objects such as white dwarfs, neutron stars, and black holes; in giant bubbles of hot gas produced by supernovas; in stellar winds; or in the h ...
... where gas has been heated to very high temperatures or particles have been accelerated to extremely high energies. These conditions can exist near collapsed objects such as white dwarfs, neutron stars, and black holes; in giant bubbles of hot gas produced by supernovas; in stellar winds; or in the h ...
Astronomy Seminar Cassy Davison A Search for Companions Around Cool Stars
... searching for planets upon which life may have had time to form. Our program, CAESAR, a Companion Assessment of Equatorial Stars with both Astrometry and Radial will determine the frequency of mid M stars with close companions, all the way down to planetary masses. We are using CSHELL at NASA's IRTF ...
... searching for planets upon which life may have had time to form. Our program, CAESAR, a Companion Assessment of Equatorial Stars with both Astrometry and Radial will determine the frequency of mid M stars with close companions, all the way down to planetary masses. We are using CSHELL at NASA's IRTF ...
HI in Local Group Dwarf Galaxies
... • Dwarf galaxies at smaller galactocentric distances have less HI on average than those at larger distances. • The HI -distance trend supports data from simulations which suggest ram-pressure stripping/tidal effects are responsible for the low HI content of dSphs • The diffuse halo density can be es ...
... • Dwarf galaxies at smaller galactocentric distances have less HI on average than those at larger distances. • The HI -distance trend supports data from simulations which suggest ram-pressure stripping/tidal effects are responsible for the low HI content of dSphs • The diffuse halo density can be es ...
Section 3-3(rev04) 2
... • The gravity is so strong that even light cannot escape. This is called a black hole. • We cannot detect a black hole directly. Any gas near it will be pulled so strongly that it will spin rapidly around the black hole. This will cause the gas to give off x-rays that we can detect. • We can also de ...
... • The gravity is so strong that even light cannot escape. This is called a black hole. • We cannot detect a black hole directly. Any gas near it will be pulled so strongly that it will spin rapidly around the black hole. This will cause the gas to give off x-rays that we can detect. • We can also de ...
Astronomy Learning Objectives and Study Questions for Chapter 13
... 6. Briefly describe the conditions that must be met if a neutron star is to behave as an X-ray burster. 1. As He and H-shell fusion cause a low-mass star like Sol to expand a second time, its outer atmosphere will waft off into space to create a/an _____. A. planetary nebula B. supernova C. nova D. ...
... 6. Briefly describe the conditions that must be met if a neutron star is to behave as an X-ray burster. 1. As He and H-shell fusion cause a low-mass star like Sol to expand a second time, its outer atmosphere will waft off into space to create a/an _____. A. planetary nebula B. supernova C. nova D. ...
Ch.21 Stars, Galaxies, and the Universe Section 3: Lives of Stars
... When a supergiant runs out of fuel, it can explode suddenly The supernovas can become part of a nebula This nebula can then contract to form a new, partly recycled star o Neutron Stars: are the remains of high-mass stars They are even smaller and denser than white dwarfs A neutron star may ...
... When a supergiant runs out of fuel, it can explode suddenly The supernovas can become part of a nebula This nebula can then contract to form a new, partly recycled star o Neutron Stars: are the remains of high-mass stars They are even smaller and denser than white dwarfs A neutron star may ...
The Daily Sun 1st Sept
... astrophysical compact objects like White Dwarfs, Pulsars, Black Holes and Super-massive Black Holes etc. The basic principle of modern cosmology, expansion of the universe, different astrophysical observations was also highlighted and supported by some videos. The key-note speaker dedicated his spee ...
... astrophysical compact objects like White Dwarfs, Pulsars, Black Holes and Super-massive Black Holes etc. The basic principle of modern cosmology, expansion of the universe, different astrophysical observations was also highlighted and supported by some videos. The key-note speaker dedicated his spee ...
File - Morgan, Kristen
... These astronomers believe 18-20 billion years ago all of the matter in the universe was packed into a very dense, very hot spot smaller than a dot! ...
... These astronomers believe 18-20 billion years ago all of the matter in the universe was packed into a very dense, very hot spot smaller than a dot! ...
Stellar Death High Mass Stars
... High Mass Stars Less than 40 M on Main Sequence Become Neutron Stars (3 M < M <1.4 M) Neutron Degeneracy Pressure ...
... High Mass Stars Less than 40 M on Main Sequence Become Neutron Stars (3 M < M <1.4 M) Neutron Degeneracy Pressure ...
Axions and White Dwarfs
... where a and b are constants of the order of unity that depend on the details of the model, and R and T are the stellar radius and the temperature at the region of period formation, respectively. This equation reflects the fact that, as the star cools down, the degeneracy of the plasma increases, the ...
... where a and b are constants of the order of unity that depend on the details of the model, and R and T are the stellar radius and the temperature at the region of period formation, respectively. This equation reflects the fact that, as the star cools down, the degeneracy of the plasma increases, the ...
Chapter20
... paths of bodies and beams of light can be plotted. supernova — An explosion in which a star’s brightness temporarily increases by as much as a billion times. Type Ia supernovae are caused by the rapid fusion of carbon and oxygen within a white dwarf. Other Type I and Type II supernovae are produced ...
... paths of bodies and beams of light can be plotted. supernova — An explosion in which a star’s brightness temporarily increases by as much as a billion times. Type Ia supernovae are caused by the rapid fusion of carbon and oxygen within a white dwarf. Other Type I and Type II supernovae are produced ...
protostars low mass stars intermediatemass stars red giant planetary
... When an intermediatemass star leaves the main sequence as it runs out of hydrogen, the shell of gases around the star begin to expand and cool, causing a reddish glow.This is where the term red giant comes from. These stars are very bright because of their larger surface area. The core bec ...
... When an intermediatemass star leaves the main sequence as it runs out of hydrogen, the shell of gases around the star begin to expand and cool, causing a reddish glow.This is where the term red giant comes from. These stars are very bright because of their larger surface area. The core bec ...
Document
... a particle to an accuracy better than Planck’s constant, h. I.e., if !x & !px are the uncertainties in the position & momentum of a particle, respectively, then • Pressure arises from the random motions of particles. Thus, for electrons, even if the temperature is 0 K, they still have motion resulti ...
... a particle to an accuracy better than Planck’s constant, h. I.e., if !x & !px are the uncertainties in the position & momentum of a particle, respectively, then • Pressure arises from the random motions of particles. Thus, for electrons, even if the temperature is 0 K, they still have motion resulti ...
Self Assessment: Life Cycle of a Star
... a) the collapse of the iron core of an intermediate mass star b) the collapse of the iron core of a star with a mass greater than about six solar masses c) the collapse of a planetary nebula d) the collapse of the a star's core during the formation of a planetary nebula 4. The length of a star's l ...
... a) the collapse of the iron core of an intermediate mass star b) the collapse of the iron core of a star with a mass greater than about six solar masses c) the collapse of a planetary nebula d) the collapse of the a star's core during the formation of a planetary nebula 4. The length of a star's l ...
Lecture 1: Welcome to Astronomy 106
... Neutron stars can not exist with masses > 3 Msun We know of no mechanism to halt the collapse of a compact object with > 3 Msun. It will collapse forming a singularity: A BLACK HOLE! ...
... Neutron stars can not exist with masses > 3 Msun We know of no mechanism to halt the collapse of a compact object with > 3 Msun. It will collapse forming a singularity: A BLACK HOLE! ...
Planets in Strange Places
... Such hot stars have fierce solar winds, so Kastner and his team are mystified why any dust in the neighborhood hasn’t long since been blown away. But there it is: an unmistakable spectral signature that both hypergiants are surrounded by mammoth disks of what might be planet-forming dust and even sa ...
... Such hot stars have fierce solar winds, so Kastner and his team are mystified why any dust in the neighborhood hasn’t long since been blown away. But there it is: an unmistakable spectral signature that both hypergiants are surrounded by mammoth disks of what might be planet-forming dust and even sa ...
Astronomy 115 Homework Set #1 – Due: Thursday, Feb
... In what ways did supernova 1987A confirm our models of supernova explosions? In what ways did it challenge it? ...
... In what ways did supernova 1987A confirm our models of supernova explosions? In what ways did it challenge it? ...
Stellar evolution, II
... it exhales its outer layers, making a planetary nebula. The degenerate core is a white dwarf star. ...
... it exhales its outer layers, making a planetary nebula. The degenerate core is a white dwarf star. ...
the maximum mass of ideal white dwarfs
... formula was found to give a much better agreement with facts than the theory of E. C. Stoner,2 based also on Fermi-Dirac statistics but on uniform distribution of density in the star which is not quite justifiable. In this note it is proposed to inquire as to what we are able to get when we use the ...
... formula was found to give a much better agreement with facts than the theory of E. C. Stoner,2 based also on Fermi-Dirac statistics but on uniform distribution of density in the star which is not quite justifiable. In this note it is proposed to inquire as to what we are able to get when we use the ...