Fifth - Department of Physics and Astronomy
... • Magnetic flux is also conserved such that the surface B fields is intensified. • The rotating B field creates an E field that rips charged particles from the surface of the star, which later get beamed by the B field and ejected at the poles. ...
... • Magnetic flux is also conserved such that the surface B fields is intensified. • The rotating B field creates an E field that rips charged particles from the surface of the star, which later get beamed by the B field and ejected at the poles. ...
Stars - Red, Blue, Old, New pt.4
... • The star gets to the point where it has a carbon core. • Core collapses but not hot enough to initiate carbon to oxygen fusion. • Most of star’s mass collapses to “degenerate matter” and star becomes a white dwarf. • Outer layers escape in a “planetary nebula”. ...
... • The star gets to the point where it has a carbon core. • Core collapses but not hot enough to initiate carbon to oxygen fusion. • Most of star’s mass collapses to “degenerate matter” and star becomes a white dwarf. • Outer layers escape in a “planetary nebula”. ...
Astronomy
... The outer layers of the star grow bigger and slowly drift out into space. This material rejoins a nebula to be recycled into a new star The blue-white hot core is left and the “dead” star that is left behind is a white dwarf The glow coming from the core is left-over energy from the old star. The co ...
... The outer layers of the star grow bigger and slowly drift out into space. This material rejoins a nebula to be recycled into a new star The blue-white hot core is left and the “dead” star that is left behind is a white dwarf The glow coming from the core is left-over energy from the old star. The co ...
Astronomy 102, Spring 2003 Solutions to Review Problems
... (A lot of neutrinos will come out in a Type Ia as well, but not as big a fraction.) If the supernova is close enough and you have a good enough neutrino detector, measuring the number of neutrinos you see from the supernova might tell you that it’s a Type II. (So far, there’s only been one supernova ...
... (A lot of neutrinos will come out in a Type Ia as well, but not as big a fraction.) If the supernova is close enough and you have a good enough neutrino detector, measuring the number of neutrinos you see from the supernova might tell you that it’s a Type II. (So far, there’s only been one supernova ...
searching for continuous gravitational wave signals with the hough
... Spinning neutron stars are promising candidates for producing gravitational wave signals detectable by the LIGO and Virgo laser interferometer detectors. These objects may generate continuous gravitational waves if they are not perfectly symmetric around their rotation axis. For these sources the em ...
... Spinning neutron stars are promising candidates for producing gravitational wave signals detectable by the LIGO and Virgo laser interferometer detectors. These objects may generate continuous gravitational waves if they are not perfectly symmetric around their rotation axis. For these sources the em ...
Chapter 13 - USD Home Pages
... thermonuclear reactions take place at its core, why doesn’t the star collapse? Answer: A white dwarf consists of carbon and oxygen. Nuclear reactions involving these nuclei require a temperature of 600 million K (pg 387). This is a lot hotter than the 10 million K for hydrogen fusion because the car ...
... thermonuclear reactions take place at its core, why doesn’t the star collapse? Answer: A white dwarf consists of carbon and oxygen. Nuclear reactions involving these nuclei require a temperature of 600 million K (pg 387). This is a lot hotter than the 10 million K for hydrogen fusion because the car ...
File - We All Love Science
... White Dwarfs? • After ejection of planetary nebula shell, the core is what’s left. That’s our white dwarf • Mainly C and O2, trace H and He on crust • Cools rapidly (by universal standards) • Eventually dies out, like an ember in a fire • Becomes so dark referred to as a black dwarf ...
... White Dwarfs? • After ejection of planetary nebula shell, the core is what’s left. That’s our white dwarf • Mainly C and O2, trace H and He on crust • Cools rapidly (by universal standards) • Eventually dies out, like an ember in a fire • Becomes so dark referred to as a black dwarf ...
HEA_Accretion_2003_04
... disk is disrupted in inner parts. Material is channeled along field lines and falls onto star at magnetic poles ...
... disk is disrupted in inner parts. Material is channeled along field lines and falls onto star at magnetic poles ...
Review Questions for Exam #2
... • In the spectra below, the temperature is the same for all three spectra. Why are the lines different strengths? ...
... • In the spectra below, the temperature is the same for all three spectra. Why are the lines different strengths? ...
Extra-Solar Planets
... Transits If a planet’s orbit happens to be perfectly edge-on from our point of view, it will pass directly between us and its star. When this happens, the light from the star will decrease very slightly (less than 1%). About 60 planets have been found by watching stars to see if they dim periodical ...
... Transits If a planet’s orbit happens to be perfectly edge-on from our point of view, it will pass directly between us and its star. When this happens, the light from the star will decrease very slightly (less than 1%). About 60 planets have been found by watching stars to see if they dim periodical ...
1) The following questions refer to the HR diagram
... A) it amplifies the contrast with red giants. B) they are both very hot and very small. C) they are supported by electron degeneracy pressure. D) they are the end-products of small, low-mass stars. E) they are the opposite of black holes. 22) What happens to the surface temperature and luminosity wh ...
... A) it amplifies the contrast with red giants. B) they are both very hot and very small. C) they are supported by electron degeneracy pressure. D) they are the end-products of small, low-mass stars. E) they are the opposite of black holes. 22) What happens to the surface temperature and luminosity wh ...
REGIONAL exam 2013
... Core collapse of a supergiant star within a cloud of expelled material Core collapse of a hydrogen-depleted supergiant ...
... Core collapse of a supergiant star within a cloud of expelled material Core collapse of a hydrogen-depleted supergiant ...
review
... • C. mass exchange between the stars • D. reduction of the quantum mechanical limitation on continued shrinking of one star by the gravitational field of the second star (C) ...
... • C. mass exchange between the stars • D. reduction of the quantum mechanical limitation on continued shrinking of one star by the gravitational field of the second star (C) ...
Stellar Evolution
... enough energy to further fuse iron so gravity quickly crushes the star, causing the protons and electrons to combine and become neutrons. At this moment, the entire outer portion of the star is blown off in a massive explosion called a supernova. This explosion creates elements that are heavier than ...
... enough energy to further fuse iron so gravity quickly crushes the star, causing the protons and electrons to combine and become neutrons. At this moment, the entire outer portion of the star is blown off in a massive explosion called a supernova. This explosion creates elements that are heavier than ...
Ch.11 Massive star death
... Massive star supernova: (Type II) Massive star builds up 1.4 Msun core and collapses into a neutron star, gravitational PE released in explosion White dwarf supernova: (Type I) ...
... Massive star supernova: (Type II) Massive star builds up 1.4 Msun core and collapses into a neutron star, gravitational PE released in explosion White dwarf supernova: (Type I) ...
9. Fascinating observations. But how much is well understood?
... luminous superflares lasting some 100 seconds but their repetition has not yet been observed. The other class of high field objects are the Anomalous X-ray Pulsars (AXP).They were discovered as pulsating X-ray sources with spin periods in the narrow range of 5 – 11 s. The NSs of both groups are prob ...
... luminous superflares lasting some 100 seconds but their repetition has not yet been observed. The other class of high field objects are the Anomalous X-ray Pulsars (AXP).They were discovered as pulsating X-ray sources with spin periods in the narrow range of 5 – 11 s. The NSs of both groups are prob ...
Chapter 12
... magnetic field axis, then this “searchlight” rotates. 4) If Earth is in the path of the rotating beam, for every rotation, a pulse is ...
... magnetic field axis, then this “searchlight” rotates. 4) If Earth is in the path of the rotating beam, for every rotation, a pulse is ...
The Death of High Mass Stars
... searchlight is like a lighthouse, which we see as a pulsar if we happen to lie in the searchlight beam. ...
... searchlight is like a lighthouse, which we see as a pulsar if we happen to lie in the searchlight beam. ...
PowerPoint Presentation - ASTR498E High energy
... Find that orbit is decaying; period is decreasing Fits prediction of GR perfectly… GWs are carrying away orbital energy Only unambiguous detection of the effects of gravitational radiation ...
... Find that orbit is decaying; period is decreasing Fits prediction of GR perfectly… GWs are carrying away orbital energy Only unambiguous detection of the effects of gravitational radiation ...
Life Cycle of a Star
... moving almost at the speed of light streaming out above their magnetic poles. -The beams of light sweep around as the pulsar rotates, just as the spotlight in a lighthouse does. -Like a ship in the ocean that sees only regular flashes of light, we see pulsars turn on and off as the beam sweeps over ...
... moving almost at the speed of light streaming out above their magnetic poles. -The beams of light sweep around as the pulsar rotates, just as the spotlight in a lighthouse does. -Like a ship in the ocean that sees only regular flashes of light, we see pulsars turn on and off as the beam sweeps over ...
PDF copy
... The discovery of the mechanism of fasting and feasting process is the breakthrough that many were looking forward to and given important inputs for further theoretical understanding of these binaries. Says Dr Bhalerao: “This allows us to better understand how massive stars form, to study how binarie ...
... The discovery of the mechanism of fasting and feasting process is the breakthrough that many were looking forward to and given important inputs for further theoretical understanding of these binaries. Says Dr Bhalerao: “This allows us to better understand how massive stars form, to study how binarie ...
8.4 White Dwarfs
... The rotating neutron star has two sources of radiation: 1) non-thermal synchrotron radiation emitted from particles trapped in the magnetic field of the neutron star, and 2) thermal radiation from particles colliding with the neutron star surface at the magnetic poles. The thermal component contains ...
... The rotating neutron star has two sources of radiation: 1) non-thermal synchrotron radiation emitted from particles trapped in the magnetic field of the neutron star, and 2) thermal radiation from particles colliding with the neutron star surface at the magnetic poles. The thermal component contains ...
Sample Math problems
... 1) From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm. What can we conclude? a) The star is getting colder b) T ...
... 1) From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm. What can we conclude? a) The star is getting colder b) T ...
What stars do Summary: Nuclear burning in stars •
... • Outer layers fall in, then get hit by rebounding core. ...
... • Outer layers fall in, then get hit by rebounding core. ...
Pulsar
A pulsar (short for pulsating radio star) is a highly magnetized, rotating neutron star that emits a beam of electromagnetic radiation. This radiation can only be observed when the beam of emission is pointing toward Earth, much the way a lighthouse can only be seen when the light is pointed in the direction of an observer, and is responsible for the pulsed appearance of emission. Neutron stars are very dense, and have short, regular rotational periods. This produces a very precise interval between pulses that range roughly from milliseconds to seconds for an individual pulsar. Pulsars are believed to be one of the candidates of high and ultra-high energy astroparticles (see also Centrifugal mechanism of acceleration).The precise periods of pulsars make them useful tools. Observations of a pulsar in a binary neutron star system were used to indirectly confirm the existence of gravitational radiation. The first extrasolar planets were discovered around a pulsar, PSR B1257+12. Certain types of pulsars rival atomic clocks in their accuracy in keeping time.