Slide 1
... gravitational fields of a black hole and a star of the same mass are virtually identical. At small distances, the much deeper gravitational potential ...
... gravitational fields of a black hole and a star of the same mass are virtually identical. At small distances, the much deeper gravitational potential ...
Review: How does a star`s mass determine its life story?
... same place cannot be in the same state • Adding mass to a white dwarf increases its gravity, forcing electrons into a smaller space • In order to avoid being in the same state some of the electrons need to move faster ...
... same place cannot be in the same state • Adding mass to a white dwarf increases its gravity, forcing electrons into a smaller space • In order to avoid being in the same state some of the electrons need to move faster ...
1 Ay 124 Winter 2016 – HOMEWORK #3
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
ASTRONOMY 120: GALAXIES AND THE UNIVERSE HOMEWORK
... • that this luminosity is caused only by the fusing of hydrogen, • that only 40% of the Sun’s original supply of Hydrogen is fused during the red giant phase, • and that 74% of the original mass of the star is in the form of Hydrogen. There are a few different ways you could conceptualize this probl ...
... • that this luminosity is caused only by the fusing of hydrogen, • that only 40% of the Sun’s original supply of Hydrogen is fused during the red giant phase, • and that 74% of the original mass of the star is in the form of Hydrogen. There are a few different ways you could conceptualize this probl ...
life cycle of stars notes
... 1. Cloud begins to collapse. The density and temp begin to rise! 2. Core of the cloud heats up to about 1000K (1340 F) 2000K (3140 F). Density rises further. 3. The cloud begins to glow as it gets hot. The protostar now has a luminosity. 4. Core collapses until Temp = 10-15 million K FUSION begins ...
... 1. Cloud begins to collapse. The density and temp begin to rise! 2. Core of the cloud heats up to about 1000K (1340 F) 2000K (3140 F). Density rises further. 3. The cloud begins to glow as it gets hot. The protostar now has a luminosity. 4. Core collapses until Temp = 10-15 million K FUSION begins ...
1 Ay 124 Winter 2014 – HOMEWORK #3
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
... Problem 1 The nearest spiral galaxy to the Milky Way, M31, has a very concentrated nucleus. At a projected radius of 1 arcsec, stars in the nucleus have a line of sight velocity dispersion of 150 km s−1 , and are also rotating about the nucleus at 150 km s−1 . The total luminosity from within 1 arc ...
AST 207 Test 1 28 September 2011
... Star X is on a bigger orbit. The radius of the orbit is the distance from the star to the center of mass of the star-companion system. Since , the mass of the companion is 1000 bigger for star X than for 51 Peg. Star X is orbiting another star, not a planet. 2. Use the drawing on the front page, whi ...
... Star X is on a bigger orbit. The radius of the orbit is the distance from the star to the center of mass of the star-companion system. Since , the mass of the companion is 1000 bigger for star X than for 51 Peg. Star X is orbiting another star, not a planet. 2. Use the drawing on the front page, whi ...
Lecture 4 January 31 - Center for Astrophysics and Space
... If they all move together, then the object moves. ...
... If they all move together, then the object moves. ...
N-Body Simulations of Star Clusters with IMBH
... connection between ULX and star clusters. Matsumoto et al. (2001) for example found a bright X-ray source at the center of the starburst galaxy M82 with an Eddington luminosity corresponding to a black hole of several hundred solar masses. Optical follow-up observations showed that the position of t ...
... connection between ULX and star clusters. Matsumoto et al. (2001) for example found a bright X-ray source at the center of the starburst galaxy M82 with an Eddington luminosity corresponding to a black hole of several hundred solar masses. Optical follow-up observations showed that the position of t ...
Star Formation
... • A brown dwarf emits infrared light because of heat left over from contraction • Its luminosity gradually declines with time as it loses thermal energy ...
... • A brown dwarf emits infrared light because of heat left over from contraction • Its luminosity gradually declines with time as it loses thermal energy ...
Neon Photoionization Experiments on the Z-Machine
... Same as the first simulations, but with mylar walls four times thicker (5.6 microns). Note that the heating of the gas is reduced by the absorption in the thicker walls. And also note that the shock waves are launched into the gas somewhat later than in the first simulation (at t=100 ns, the shock h ...
... Same as the first simulations, but with mylar walls four times thicker (5.6 microns). Note that the heating of the gas is reduced by the absorption in the thicker walls. And also note that the shock waves are launched into the gas somewhat later than in the first simulation (at t=100 ns, the shock h ...
Stan Woosley (UCSC)
... pulsar of < 5 ms period if rotation and B-fields are to matter at all. Need a period of ~ 1 ms to make GRBs. This is much faster than observed in common pulsars. Total rotational kinetic energy for a neutron star E rot ~ 2 1052 (1 ms/P)2 (R/10 km)2 erg j R 2 ~ 6.31015 (1ms/P) (R/10 km)2 cm2 s- ...
... pulsar of < 5 ms period if rotation and B-fields are to matter at all. Need a period of ~ 1 ms to make GRBs. This is much faster than observed in common pulsars. Total rotational kinetic energy for a neutron star E rot ~ 2 1052 (1 ms/P)2 (R/10 km)2 erg j R 2 ~ 6.31015 (1ms/P) (R/10 km)2 cm2 s- ...
Word doc - UC-HiPACC - University of California, Santa Cruz
... postdoctoral researcher Ke-Jung Chen stumbled on the unanticipated discovery that some primordial supermassive stars could explode without leaving any black hole or other stellar remnant behind. Chen had been fascinated by supermassive black holes since grad school at the University of Minnesota. Ev ...
... postdoctoral researcher Ke-Jung Chen stumbled on the unanticipated discovery that some primordial supermassive stars could explode without leaving any black hole or other stellar remnant behind. Chen had been fascinated by supermassive black holes since grad school at the University of Minnesota. Ev ...
Notes - Michigan State University
... If a stellar core grows beyond its Chandrasekhar mass limit, it will collapse. Typically this will result in a Supernova explosion at least the outer part of a star is blown off into space ...
... If a stellar core grows beyond its Chandrasekhar mass limit, it will collapse. Typically this will result in a Supernova explosion at least the outer part of a star is blown off into space ...
HR Diagram and Life of a star
... temp This means that they are very large and can range in size from 100-1000 times the size of the sun GIANTS- large bright stars a bit smaller and fainter than Super giants Super giants in the Red temp range tend to be in their last stages of life. They are out of hydrogen and are now fusing Helium ...
... temp This means that they are very large and can range in size from 100-1000 times the size of the sun GIANTS- large bright stars a bit smaller and fainter than Super giants Super giants in the Red temp range tend to be in their last stages of life. They are out of hydrogen and are now fusing Helium ...
Document
... Very high rotation rates can be reached simply via conservation of angular momentum. This is faster than any known (or possible) neutron star. Mass and angular momentum are lost during the collapse. ...
... Very high rotation rates can be reached simply via conservation of angular momentum. This is faster than any known (or possible) neutron star. Mass and angular momentum are lost during the collapse. ...
Practice Questions for Exam 3
... Which of the following is the best answer to the question "Why does the Sun shine?" A. As the Sun was forming, nuclear fusion reactions in the shrinking clouds of gas slowly became stronger and stronger, until the Sun reached its current luminosity. B. The Sun initially began making energy through c ...
... Which of the following is the best answer to the question "Why does the Sun shine?" A. As the Sun was forming, nuclear fusion reactions in the shrinking clouds of gas slowly became stronger and stronger, until the Sun reached its current luminosity. B. The Sun initially began making energy through c ...
Lecture 3 - QUB Astrophysics Research Centre
... Now dM=ρdV and the Virial theorem can be written ...
... Now dM=ρdV and the Virial theorem can be written ...
Black Holes
... • Black hole is a very strong magnetic place that can suck up anything that goes pass even light. Back hole can also be described as a very big vacuum cleaner. It is also invisible. No one knows what the black hole looks like. There is also three types of black holes. ...
... • Black hole is a very strong magnetic place that can suck up anything that goes pass even light. Back hole can also be described as a very big vacuum cleaner. It is also invisible. No one knows what the black hole looks like. There is also three types of black holes. ...
PHYSICS 113 Practice Questions #2
... a. a distant galaxy of stars and raw material b. a small disk of gas and dust surrounding a single star that was recently formed c. a cloud o f gas and du st illuminated by th e light of newly form ed stars within it d. the remnant of a star that exploded several thousand years ago e. an illusion ca ...
... a. a distant galaxy of stars and raw material b. a small disk of gas and dust surrounding a single star that was recently formed c. a cloud o f gas and du st illuminated by th e light of newly form ed stars within it d. the remnant of a star that exploded several thousand years ago e. an illusion ca ...
The Life and Times of a Neutron Star
... Z Magnetic stress builds in the crust until it fractures and the field rearranges itself locally leading to hard X-ray burst. Z ...
... Z Magnetic stress builds in the crust until it fractures and the field rearranges itself locally leading to hard X-ray burst. Z ...
What is at the surface of a black hole?
... 3: List the three properties that completely characterize a black hole. 4: Describe how energy can be extracted from certain types of black holes and indicate what property a black hole must have to allow such extraction. 5: Discuss the evidence that suggest that black holes exist in binary systems ...
... 3: List the three properties that completely characterize a black hole. 4: Describe how energy can be extracted from certain types of black holes and indicate what property a black hole must have to allow such extraction. 5: Discuss the evidence that suggest that black holes exist in binary systems ...
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.