dtu7ech13 - Fort Thomas Independent Schools
... cease nuclear fusion. Its remnant white dwarf will dim over the succeeding billions of years. What is a nova? A nova is a relatively gentle explosion of hydrogen gas on the surface of a white dwarf in a binary star system. What are the origins of the carbon, silicon, oxygen, iron, uranium, and other ...
... cease nuclear fusion. Its remnant white dwarf will dim over the succeeding billions of years. What is a nova? A nova is a relatively gentle explosion of hydrogen gas on the surface of a white dwarf in a binary star system. What are the origins of the carbon, silicon, oxygen, iron, uranium, and other ...
Slides from Dr. Frank`s Lecture17
... The following processes are inevitable in a binary: 1) The binary separation decreases because of gravitational radiation and other angular momentum losses. 2) The component stars will evolve and change size (for example becoming a red giant) Conclusion: Long period (wide) binaries may never become ...
... The following processes are inevitable in a binary: 1) The binary separation decreases because of gravitational radiation and other angular momentum losses. 2) The component stars will evolve and change size (for example becoming a red giant) Conclusion: Long period (wide) binaries may never become ...
Quantum Well Electron Gain Structures and Infrared
... • Original distance more robust than others, but consistent with all (once you put in error bars!) • MLBV > 150 M0 total; >75 M0 for binary • More: we see major LBV line variability (factors of ~5-6 variation in EW in 1 year) implies that one star is dominant source of ionizing radiation • Thus, e ...
... • Original distance more robust than others, but consistent with all (once you put in error bars!) • MLBV > 150 M0 total; >75 M0 for binary • More: we see major LBV line variability (factors of ~5-6 variation in EW in 1 year) implies that one star is dominant source of ionizing radiation • Thus, e ...
Week 11 Concept Summary
... found there. There is no gas and dust, and what stars are there have very low concentrations of heavy elements. They also orbit randomly in the gallaxy. 2. Interstellar Medium: This is the gas and dust that floats freely about the galaxy. It is what blocks visible light and only allows us to see nea ...
... found there. There is no gas and dust, and what stars are there have very low concentrations of heavy elements. They also orbit randomly in the gallaxy. 2. Interstellar Medium: This is the gas and dust that floats freely about the galaxy. It is what blocks visible light and only allows us to see nea ...
Stellar Evolution - Hays High School
... concentrated in the central regions of the galaxy. The X-ray source could be another example of a veiled black hole associated with a Type 2 Quasar. This discovery adds to a CXO 0312 Fiore P3 (CXOUJ031238.9growing body of evidence that our 765134): A possible Type 2 quasar veiled black hole.(Credit: ...
... concentrated in the central regions of the galaxy. The X-ray source could be another example of a veiled black hole associated with a Type 2 Quasar. This discovery adds to a CXO 0312 Fiore P3 (CXOUJ031238.9growing body of evidence that our 765134): A possible Type 2 quasar veiled black hole.(Credit: ...
Ch. 26.5: The Expanding Universe
... Galaxies are accelerating faster than they should be (based on the observable matter in the Universe). The acceleration due to gravity does not match up with the amount of matter that we can see. This tells us that there must be more mass … we’re just not seeing it. ...
... Galaxies are accelerating faster than they should be (based on the observable matter in the Universe). The acceleration due to gravity does not match up with the amount of matter that we can see. This tells us that there must be more mass … we’re just not seeing it. ...
Stellar Evolution - Hays High Indians
... • Warming occurs slowly at first • Center begins to glow, dim to bright • When central temperature is high enough (~15 000 K, ~15 273 C) nuclear reactions can begin • Protostar has now become a true star ...
... • Warming occurs slowly at first • Center begins to glow, dim to bright • When central temperature is high enough (~15 000 K, ~15 273 C) nuclear reactions can begin • Protostar has now become a true star ...
Paper - Astrophysics - University of Oxford
... 2.1. Formation of stars across the Universe When did stars form? To answer this basic question we can make use of the fact that every star must eventually die. Indeed the more massive stars die in spectacular supernova explosions that can outshine a whole galaxy. With an ELT these explosions can be ...
... 2.1. Formation of stars across the Universe When did stars form? To answer this basic question we can make use of the fact that every star must eventually die. Indeed the more massive stars die in spectacular supernova explosions that can outshine a whole galaxy. With an ELT these explosions can be ...
Chapter 28 powerpoint presentation
... then dm/dt increases to only 1 M/yr which is still a trivial amount. So, the high luminosity is not due to a high infall rate but rather is due to the enormous depth of the gravitational potential well that the material is falling into. One final word on singularities. Black holes have finite mass ...
... then dm/dt increases to only 1 M/yr which is still a trivial amount. So, the high luminosity is not due to a high infall rate but rather is due to the enormous depth of the gravitational potential well that the material is falling into. One final word on singularities. Black holes have finite mass ...
Chapter13
... Matter in the accretion disk heats up to ~ 1 million K => X-ray emission => “X-ray binary”. ...
... Matter in the accretion disk heats up to ~ 1 million K => X-ray emission => “X-ray binary”. ...
Lecture 10a Neutron Star and Black Holes (Test 2 overview)
... • Black holes can keep accumulating mass…including “colliding” Black holes. Very massive (million times mass Sun) at center of many galaxies ...
... • Black holes can keep accumulating mass…including “colliding” Black holes. Very massive (million times mass Sun) at center of many galaxies ...
Origin of the Universe
... energy in specific portions-wavelengths-within the electromagnetic spectrum. Because the human eye observes different wavelengths of visible light as different colors, people can distinguish specific portions of the electiomagrretic spectrum. When scientists study the spectrum of electromagnetic ene ...
... energy in specific portions-wavelengths-within the electromagnetic spectrum. Because the human eye observes different wavelengths of visible light as different colors, people can distinguish specific portions of the electiomagrretic spectrum. When scientists study the spectrum of electromagnetic ene ...
Review: How does a star*s mass determine its life story?
... • As a white dwarf’s mass approaches 1.4MSun, its electrons must move at nearly the speed of light. • Because nothing can move faster than light, a white dwarf cannot be more massive than 1.4MSun, the white dwarf limit (also known as the Chandrasekhar limit). ...
... • As a white dwarf’s mass approaches 1.4MSun, its electrons must move at nearly the speed of light. • Because nothing can move faster than light, a white dwarf cannot be more massive than 1.4MSun, the white dwarf limit (also known as the Chandrasekhar limit). ...
Lecture - Ann Arbor Earth Science
... Our Universe In 1995, the Hubble Space Telescope pointed at a blank area of the sky near Ursa Major for 10 days. It produced this picture. Almost all the objects in this photograph are galaxies that are located between 5 and 10 billion light years away from Earth. Younger galaxies are blue while ol ...
... Our Universe In 1995, the Hubble Space Telescope pointed at a blank area of the sky near Ursa Major for 10 days. It produced this picture. Almost all the objects in this photograph are galaxies that are located between 5 and 10 billion light years away from Earth. Younger galaxies are blue while ol ...
Ch 20 Notes Stars
... • Universe: consists of all space, matter and energy that exists- now, in the past or in the future • We see the universe now as it was in the past • The farther an object is, the older the light that we get from that object is • The sun is 8 light minutes away, that means we are seeing what the sun ...
... • Universe: consists of all space, matter and energy that exists- now, in the past or in the future • We see the universe now as it was in the past • The farther an object is, the older the light that we get from that object is • The sun is 8 light minutes away, that means we are seeing what the sun ...
Galaxy Classification - Starry Night Education
... Q uestion 7: Which statement best describes the geometry of the solar system's location within the Milky Way galaxy? a. The plane of the solar system is coincident with the plane of the galaxy. b. The plane of the solar system is perpendicular to that of the Milky Way. c. The plane of the solar syst ...
... Q uestion 7: Which statement best describes the geometry of the solar system's location within the Milky Way galaxy? a. The plane of the solar system is coincident with the plane of the galaxy. b. The plane of the solar system is perpendicular to that of the Milky Way. c. The plane of the solar syst ...
Document
... the rst stars, the so-called population III stars, formed. These stars brought visible light back to the universe. Figure 1.1 displays the mass distribution of a tiny section of the universe, generated using a computer simulation in a box with a side length of 100 Mpc. Here distances are given in p ...
... the rst stars, the so-called population III stars, formed. These stars brought visible light back to the universe. Figure 1.1 displays the mass distribution of a tiny section of the universe, generated using a computer simulation in a box with a side length of 100 Mpc. Here distances are given in p ...
chapter18StarDeath
... • Where do gamma-ray bursts come from? – Most gamma-ray bursts come from distant galaxies – They must be among the most powerful explosions in the universe, probably signifying the formation of black holes ...
... • Where do gamma-ray bursts come from? – Most gamma-ray bursts come from distant galaxies – They must be among the most powerful explosions in the universe, probably signifying the formation of black holes ...
Death of Massive Stars
... 1. Speed of light is a constant and nothing can travel faster Speed of light = 300,000 km/s (180,000 miles/s) 2. The faster something moves, the slower time appears to move for it -For every second that passes on Earth, 0.99999999967 seconds pass on the international space station (orbiting at about ...
... 1. Speed of light is a constant and nothing can travel faster Speed of light = 300,000 km/s (180,000 miles/s) 2. The faster something moves, the slower time appears to move for it -For every second that passes on Earth, 0.99999999967 seconds pass on the international space station (orbiting at about ...
Chapter 18 The Bizarre Stellar Graveyard What is a white dwarf
... “Surface” of a Black Hole • The “surface” of a black hole is the radius at which the escape velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the ...
... “Surface” of a Black Hole • The “surface” of a black hole is the radius at which the escape velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the ...
neutron star.
... A black hole is an object whose gravity is so powerful that not even light can escape it. Some massive star supernovae can make a black hole if enough mass falls onto the core. ...
... A black hole is an object whose gravity is so powerful that not even light can escape it. Some massive star supernovae can make a black hole if enough mass falls onto the core. ...
Gamma-ray burst
Gamma-ray bursts (GRBs) are flashes of gamma rays associated with extremely energetic explosions that have been observed in distant galaxies. They are the brightest electromagnetic events known to occur in the universe. Bursts can last from ten milliseconds to several hours. The initial burst is usually followed by a longer-lived ""afterglow"" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio).Most observed GRBs are believed to consist of a narrow beam of intense radiation released during a supernova or hypernova as a rapidly rotating, high-mass star collapses to form a neutron star, quark star, or black hole. A subclass of GRBs (the ""short"" bursts) appear to originate from a different process – this may be due to the merger of binary neutron stars. The cause of the precursor burst observed in some of these short events may be due to the development of a resonance between the crust and core of such stars as a result of the massive tidal forces experienced in the seconds leading up to their collision, causing the entire crust of the star to shatter.The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare (a few per galaxy per million years). All observed GRBs have originated from outside the Milky Way galaxy, although a related class of phenomena, soft gamma repeater flares, are associated with magnetars within the Milky Way. It has been hypothesized that a gamma-ray burst in the Milky Way, pointing directly towards the Earth, could cause a mass extinction event.GRBs were first detected in 1967 by the Vela satellites, a series of satellites designed to detect covert nuclear weapons tests. Hundreds of theoretical models were proposed to explain these bursts in the years following their discovery, such as collisions between comets and neutron stars. Little information was available to verify these models until the 1997 detection of the first X-ray and optical afterglows and direct measurement of their redshifts using optical spectroscopy, and thus their distances and energy outputs. These discoveries, and subsequent studies of the galaxies and supernovae associated with the bursts, clarified the distance and luminosity of GRBs. These facts definitively placed them in distant galaxies and also connected long GRBs with the explosion of massive stars, the only possible source for the energy outputs observed.