E) none of the above . Expert Answer 100% (1 rating) When a massive star explodes, the dead star emits huge amount of radio waves through its poles. The average density of neutron stars approaches: a) about 10^17 kg/m3, similar to the density of atomic nuclei. b) It is the remnant of a supernova observed by humans. A neutron star cannot be more massive than 3. Una Pulsar millisecondo (MSP) è una pulsar con un periodo rotazionale compreso tra 1 e 10 millisecondi.Può essere visibile nella porzione dello spettro in microonde o nei raggi X.. L'origine delle pulsar millisecondo è per certi versi misteriosa. Fermi Gamma-ray Space Telescope, U.S. satellite, launched June 11, 2008, that was designed to study gamma ray-emitting sources. All millisecond pulsars are now, or once were, members of binary-star systems. d) more than 25 times the mass of the Sun. According to the NS-Capture theory all pulsars fall into one of the following 2 classes: pulsars that are precursors to a supernova explosion There is no difference in the light curve for a hypernova and the light curve for a supernova II; the two events are distinguished from other properties. The National As a pulsar cools, it collapses further. This causes its rotation rate to increase. According to the special theory of relativity, as the speed of a rocket ship increases, an observer sees the mass of a spaceship: To an observer on Earth, the clock on a spaceship moving at constant, but high velocity, would: What effect predicted by Einstein's theory of general relativity is confirmed during a solar eclipse? Astronomers believe that gamma-ray bursters emit radiation equally in all directions. Starting from an ordinary radio pulsar in a binary with a normal low mass star - Pulsar spins down due to loss of energy from dipole radiation When the mass is transferred to a neutron star, the, The difference between a nova and an X­ray burst is, that a nova involves an explosion on the surface of a. What is the cause of millisecond pulsars? Pulsars in globular clusters, most of which have a normal star or white dwarf companion. The Schwarzschild radius of a black hole is about 3 km per solar mass; it is amazingly linear over a wide range of masses. Start studying Neutron star/ black holes. This mass, impacting the pulsar's surface, causes its rotation rate to increase. the light from distant stars to be bent or focused by unseen massive objects in its path: Term. c) The star would erupt as a carbon detonation (type I) supernova. a) It could eventually become a black hole, via a hypernova explosion. What will happen to an isolated neutron star that accumulates more than about 3 solar masses of material? What characteristic of a star cluster is used to determine its age? X-ray bursters are caused by a process similar to the process in which other object? Thus, we must rule out eclipsing binaries as the cause of pulsars. b) millisecond ones are only found in globular clusters, while normal ones are not. A Type II supernova (plural: supernovae or supernovas) results from the rapid collapse and violent explosion of a massive star.A star must have at least 8 times, but no more than 40 to 50 times, the mass of the Sun (M ☉) to undergo this type of explosion. D) Pulsars have the same upper mass limit as neutron stars do. This pulsar's speed is such that: At its equator it is spinning at approximately 24% of the speed of light, or over 70,000 km per second. In 1974 Hewish was awarded the Nobel prize in physics for the discovery of pulsars. accretion disk around a black hole, and, consequently, periodic clumps of material falling from the disk into, the black hole and being compressed produce the X, material transferred onto the surface of a neutron, star, causing the neutron star to collapse suddenly, star in a binary system, then subsequently ignited in a, thermonuclear explosion that leaves the neutron star, material transferred onto the surface of a white, dwarf in a binary star system, producing a, thermonuclear explosion at the surface while leaving. These bursts of X rays are believed to be caused by, material from a companion star pulled into an. The observed slowing of a clock in the vicinity of a black hole is a prediction of: The energy from the accretion disk around a black hole would show gravitational redshift due to its immense gravity and tidal distortion of space there. d) It is rather bright at visible wavelengths. 15) Many of the millisecond pulsars lie in _____, suggesting great stellar density. Why aren't all young neutron stars seen as pulsars? The pulses result from electrodynamic phenomena generated by their rotation and their strong magnetic fields, … What defines the event horizon of a black hole? C) No massive object, other than a neutron star, could spin as fast as we observe pulsars to spin and remain intact. d) Gravity is the result of curved spacetime. While most neutron stars are also pulsars, an older "bare" neutron star was captured in rapid motion only 200 lightly years distant by: In binary neutron star systems, the orbits are expected to slowly decay, eventually resulting in a merger of the neutron stars. In essence, gravity from the white dwarf star slightly warps the space surrounding it, in accordance with Einstein's general theory of relativity. LIGO detected gravitational waves that probably originated from: What can distinguish a black hole from an unseen neutron star, other than evidence of the object's mass? Which of the following is NOT an argument for Cygnus X-1's being a true black hole? d) The mass of the visible B star is even greater than Cygnus X-1, at around 25 solar masses. This would cause the orbiting stars to spiral together and the period would decrease. Pulsating variable stars vary their light output periodically. The life ending event for a very massive star can result in long duration gamma-ray bursts. Special relativity predicts that light bends near dense objects. Pulsars spin-down as they age, and this should weaken particle acceleration, which in turn should cause their gamma-ray flux to weaken. Neutron stars seem to travel a good deal faster than most stars in orbit about the Galaxy. Millisecond pulsars are used because they appear not to be prone to the starquakes and accretion events which can affect the period of classical pulsars.. Why does the existence of planets around a millisecond pulsar come as a surprise? These pulsar s have periods as short as between one and two milliseconds and their periods are very constant. MA, a limit set by general re-lativity. The equivalence principle says that a person in an elevator that is in free fall feels the same acceleration as: b) a person in space, far from any gravitational source accelerating at g. If light from a distant star passes close to a massive body, the light beam will: Special relativity says that c, the speed of light, is the maximum velocity for both matter and energy in our universe. What explanation does general relativity provide for gravity? CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract. Answer: C. 23) What is the ultimate fate of an isolated pulsar? An object more massive than the Sun, but roughly the size of a city, is a: General relativity explains the observed precession of the orbit of: What would happen if mass is added to a 1.4 solar mass white dwarf? What is the probable cause of the rapid rotation of the millisecond pulsars? MA (Nice et al. All neutron stars must begin as millisecond pulsars just after their supernova creation. These results favour a stiff EOS. How are millisecond pulsars formed? 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