2. Stellar Physics
... Problem of stellar structure is simplified by making several reasonable assumptions, which hold in most (not all) cases. 1) Spherical symmetry An isolated, non-rotating star which does not contain strong magnetic fields will be spherically symmetric, i.e.: All quantities (e.g. density, temperature, ...
... Problem of stellar structure is simplified by making several reasonable assumptions, which hold in most (not all) cases. 1) Spherical symmetry An isolated, non-rotating star which does not contain strong magnetic fields will be spherically symmetric, i.e.: All quantities (e.g. density, temperature, ...
Answer ALL questions from SECTION A and TWO questions from
... 4. List the physical processes that give rise to the continuous opacity in stars. ...
... 4. List the physical processes that give rise to the continuous opacity in stars. ...
Exploring the Planet Forming Environments of Young Suns
... Very Large Spots • young, low-mass stars fully convective • rotating rapidly • convection and rotation drive strong dynamo & superspots • observed photometrically and spectroscopically ...
... Very Large Spots • young, low-mass stars fully convective • rotating rapidly • convection and rotation drive strong dynamo & superspots • observed photometrically and spectroscopically ...
black hole - Purdue Physics
... • Degenerate matter obeys different laws of physics. • The more mass the star has, the smaller the star becomes! • increased gravity makes the star denser • greater density increases degeneracy pressure to balance gravity ...
... • Degenerate matter obeys different laws of physics. • The more mass the star has, the smaller the star becomes! • increased gravity makes the star denser • greater density increases degeneracy pressure to balance gravity ...
Study Guide: Unit 1, The Universe and its Stars, HS
... 12) HS-ESS1-1 The name applied to concentrations of interstellar matter that glow when it is close to very hot stars is ________. A) granules B) prominences C) nebulas D) quasars E) plages 13) HS-ESS1-1 As _____________ shrinks, gravitational energy is converted into energy of motion, or heat energy ...
... 12) HS-ESS1-1 The name applied to concentrations of interstellar matter that glow when it is close to very hot stars is ________. A) granules B) prominences C) nebulas D) quasars E) plages 13) HS-ESS1-1 As _____________ shrinks, gravitational energy is converted into energy of motion, or heat energy ...
PHYS 2421 EXAM #5 Wednesday, November 11
... 98. To alleviate the traffic congestion between two cities such as Boston and Washington, D.C., engineers have proposed building a rail tunnel along a chord line connecting the cities (Fig. 13-55). A train, unpropelled by any engine and starting from rest, would fall through the first half of the tu ...
... 98. To alleviate the traffic congestion between two cities such as Boston and Washington, D.C., engineers have proposed building a rail tunnel along a chord line connecting the cities (Fig. 13-55). A train, unpropelled by any engine and starting from rest, would fall through the first half of the tu ...
Answers to Final Exam – Study Guide
... 82. The rate at which an object changes its velocity is called acceleration 83. The type of friction that an airplane that is flying experiences is called fluid friction 84. The property of a moving object that depends on its mass and velocity is called momentum 85. The two components of all forces ...
... 82. The rate at which an object changes its velocity is called acceleration 83. The type of friction that an airplane that is flying experiences is called fluid friction 84. The property of a moving object that depends on its mass and velocity is called momentum 85. The two components of all forces ...
Evolution Cycle of Stars
... • These stars are composed mainly of neutrons and are produced when a supernova explodes, forcing the protons and electrons to combine to produce a neutron star. • Neutron stars are very dense. Typical stars having a mass of three times the Sun but a diameter of only 20 km. If its mass is any greate ...
... • These stars are composed mainly of neutrons and are produced when a supernova explodes, forcing the protons and electrons to combine to produce a neutron star. • Neutron stars are very dense. Typical stars having a mass of three times the Sun but a diameter of only 20 km. If its mass is any greate ...
Due Date: Thursday, November 16, 2006
... have exploded as a supernova several billion years ago. Jupiter and Earth probably would not survive the supernova explosion… The most significant difference between a high-mass star and the Sun will be their lifetime! Look at the HR diagram in Figure 11.1. The lifetime of Spica (10 Msun) is only ab ...
... have exploded as a supernova several billion years ago. Jupiter and Earth probably would not survive the supernova explosion… The most significant difference between a high-mass star and the Sun will be their lifetime! Look at the HR diagram in Figure 11.1. The lifetime of Spica (10 Msun) is only ab ...
Stellar Evolution - Hays High School
... • 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 ...
Stars and Their Life Cycles
... you need to accelerate at 7 miles per second (12 times faster than a bullet). We have been able to do this with rockets since ...
... you need to accelerate at 7 miles per second (12 times faster than a bullet). We have been able to do this with rockets since ...
E3 STELLAR DISTANCES E4 COSMOLOGY
... A main sequence star emits most of its energy at λ = 2.4 x 10-7 m. Its apparent brightness is measure at 4.3 x 10-9 W m-2. How far away is the star? [28 pc] ...
... A main sequence star emits most of its energy at λ = 2.4 x 10-7 m. Its apparent brightness is measure at 4.3 x 10-9 W m-2. How far away is the star? [28 pc] ...
Information (Word Doc)
... (with a mass up to 1 1/2 times that of the Sun) Once a medium size star (such as our Sun) has reached the red giant phase, its outer layers continue to expand, but it’s core contracts, the result being that helium atoms together to form carbon. This fusion releases new energy but only for a few minu ...
... (with a mass up to 1 1/2 times that of the Sun) Once a medium size star (such as our Sun) has reached the red giant phase, its outer layers continue to expand, but it’s core contracts, the result being that helium atoms together to form carbon. This fusion releases new energy but only for a few minu ...
NEUTRON STAR?
... • We will be holding an optional observing night this coming Tuesday, Nov. 8th from 7-9 p.m. on the Science Center roof. We'll be looking at Mars, stellar clusters, binary stars, and more... • Because we live in lovely cloudy Boston, we have to prepare for inclement weather. We will make an announce ...
... • We will be holding an optional observing night this coming Tuesday, Nov. 8th from 7-9 p.m. on the Science Center roof. We'll be looking at Mars, stellar clusters, binary stars, and more... • Because we live in lovely cloudy Boston, we have to prepare for inclement weather. We will make an announce ...
Quantum Well Electron Gain Structures and Infrared
... consistent with MC) • With distance L > 4x106 L0 (similar to Eta Car and Pistol Star) • Implies mass > 150 M0 (Eddington-based) • Not a cluster; is it a binary?? Even if binary, minimum mass > 75 M0 • So … • SGR = neutron star already; if same birthdate, progenitor must have been more massive than ...
... consistent with MC) • With distance L > 4x106 L0 (similar to Eta Car and Pistol Star) • Implies mass > 150 M0 (Eddington-based) • Not a cluster; is it a binary?? Even if binary, minimum mass > 75 M0 • So … • SGR = neutron star already; if same birthdate, progenitor must have been more massive than ...
Gravitational potential energy
... [ ] denotes logarithmic ratio. At very early times, [Fe/H]=negative (e.g. =-1.5) since the heavy elements have not be created yet, Type II Supernovae occur at earlier times. They produce both O and Fe and so [O/Fe] is zero. At later times, Type I Supernovae make more heavy elements. they contribute ...
... [ ] denotes logarithmic ratio. At very early times, [Fe/H]=negative (e.g. =-1.5) since the heavy elements have not be created yet, Type II Supernovae occur at earlier times. They produce both O and Fe and so [O/Fe] is zero. At later times, Type I Supernovae make more heavy elements. they contribute ...
Equations of Stellar Structure Stellar structure and evolution can be
... κν = the opacity (photon cross section) per unit mass of material. ...
... κν = the opacity (photon cross section) per unit mass of material. ...
Black Holes - schoolphysics
... Black Holes may be as big as a star or even larger so one day somebody may run into one. If they do we will never see them again. How we can ‘see’ a black hole We can’t actually observe a black hole directly but we can ‘see’ black holes because of its effect on its surroundings. The material close ...
... Black Holes may be as big as a star or even larger so one day somebody may run into one. If they do we will never see them again. How we can ‘see’ a black hole We can’t actually observe a black hole directly but we can ‘see’ black holes because of its effect on its surroundings. The material close ...
BlackHolesOLD - Montgomery College
... Some X-ray binaries show jets perpendicular to the accretion disk ...
... Some X-ray binaries show jets perpendicular to the accretion disk ...
Earth Science: Chapter 7: Stellar Evolution: Spring 2017: Student
... Supernova: a massive explosion that causes an extremely bright event in the sky. When massive star runs out of fuel gravity causes an inward collapse toward the core and the rebound causes a massive explosion. Last supernova witnessed was in the 1600’s. Neutron star: has about 500,000 times Earth's ...
... Supernova: a massive explosion that causes an extremely bright event in the sky. When massive star runs out of fuel gravity causes an inward collapse toward the core and the rebound causes a massive explosion. Last supernova witnessed was in the 1600’s. Neutron star: has about 500,000 times Earth's ...
Document
... astronomers, discovered a periodic signal in the radio part of the spectrum, coming from a distant galaxy. • Astronomers considered (briefly) the possibility of an alien civilization sending the regular pulses. ...
... astronomers, discovered a periodic signal in the radio part of the spectrum, coming from a distant galaxy. • Astronomers considered (briefly) the possibility of an alien civilization sending the regular pulses. ...
Recap: High Mass Stars
... • Core is no longer fusing (iron is it!) • The balance of pressure loses and the entire star collapses • Massive explosion – Creates heavier elements ...
... • Core is no longer fusing (iron is it!) • The balance of pressure loses and the entire star collapses • Massive explosion – Creates heavier elements ...
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.