Scientific Justification
... where they can begin to pulsate. The interval where a given white dwarf will pulsate is determined by its spectral type. The hydrogen-atmosphere variables (DAVs), clustered near T eff ∼ 12, 000 K, are the coolest class of pulsating white dwarfs. Just as earthquakes allow seismologists to study the i ...
... where they can begin to pulsate. The interval where a given white dwarf will pulsate is determined by its spectral type. The hydrogen-atmosphere variables (DAVs), clustered near T eff ∼ 12, 000 K, are the coolest class of pulsating white dwarfs. Just as earthquakes allow seismologists to study the i ...
STARS
... • Leftover core has between 1.4 – 3 solar masses • Collapses so much that protons and electrons combine to form neutrons • Very dense (a thimbleful weights more than 100 million tons) • Emit radio waves (pulsars) ...
... • Leftover core has between 1.4 – 3 solar masses • Collapses so much that protons and electrons combine to form neutrons • Very dense (a thimbleful weights more than 100 million tons) • Emit radio waves (pulsars) ...
THE ROLE OF BLACK HOLES IN GALAXY FORMATION Tiziana Di Matteo
... THE DISCOVERY OF QUASARS (Quasi-Stellar Objects) IN GALAXIES ...
... THE DISCOVERY OF QUASARS (Quasi-Stellar Objects) IN GALAXIES ...
What is a Star? - Lisle CUSD 202
... The core is now very dense and very hot. (A tablespoon full would weigh 5 tons!) The stars outer layers drift away and become a planetary nebula. A white dwarf is about 8,000 miles in diameter. After 35,000 years, the core begins to cool. ...
... The core is now very dense and very hot. (A tablespoon full would weigh 5 tons!) The stars outer layers drift away and become a planetary nebula. A white dwarf is about 8,000 miles in diameter. After 35,000 years, the core begins to cool. ...
Star G has an apparent magnitude of +5.0 and an absolute
... Alpha Centauri has about the same radius and surface temperature as our Sun, and is about 1.33 pc from Earth. It has apparent magnitude zero, while our sun has apparent magnitude -27. • The luminosity of α Cen is larger than our Sun • The luminosity of α Cen is much less than our Sun • The flux fro ...
... Alpha Centauri has about the same radius and surface temperature as our Sun, and is about 1.33 pc from Earth. It has apparent magnitude zero, while our sun has apparent magnitude -27. • The luminosity of α Cen is larger than our Sun • The luminosity of α Cen is much less than our Sun • The flux fro ...
Neutron Star Crustal Emission: a basic, unanswered question.
... Critical T for H and Fe. Condensation is possible in the shaded region for Fe and in the cross-hatched region for H. Filled circles are the NSs listed in the table. The horizontal line is the color temperature of RX J1856.5-3754 ...
... Critical T for H and Fe. Condensation is possible in the shaded region for Fe and in the cross-hatched region for H. Filled circles are the NSs listed in the table. The horizontal line is the color temperature of RX J1856.5-3754 ...
Linking Asteroids and Meteorites through Reflectance Spectroscopy
... • Event Horizon is the boundary between the inside and outside of the Black Hole • Within the Event Horizon, the escape velocity is greater than the speed of light • Nothing can escape once it enters the Event ...
... • Event Horizon is the boundary between the inside and outside of the Black Hole • Within the Event Horizon, the escape velocity is greater than the speed of light • Nothing can escape once it enters the Event ...
Neutron Stars PowerPoint
... • Discovered in 1971 by the Uhuru spacecraft – High-energy pulsars are in close binary systems • Deduced from cyclical Doppler shift every 1.7 days • Pulsing period of ~ 1.24 seconds ...
... • Discovered in 1971 by the Uhuru spacecraft – High-energy pulsars are in close binary systems • Deduced from cyclical Doppler shift every 1.7 days • Pulsing period of ~ 1.24 seconds ...
GRB Progenitors and their environments
... • Collapsar Models: Can be produced in single and binary stars. Single star models require high rotation with minimal angular momentum loss in winds (perhaps rotationally-induced mixing can help?). Binary systems are used to i) remove the hydrogen envelope without losing angular momentum, ii) spinni ...
... • Collapsar Models: Can be produced in single and binary stars. Single star models require high rotation with minimal angular momentum loss in winds (perhaps rotationally-induced mixing can help?). Binary systems are used to i) remove the hydrogen envelope without losing angular momentum, ii) spinni ...
The Astrophysics of Massive Black Hole Mergers
... • Activity from stellar tidal disruption may account for a significant fraction of low-luminosity AGN. • Understanding of the population of low-mass massive black holes a top scientific priority. ...
... • Activity from stellar tidal disruption may account for a significant fraction of low-luminosity AGN. • Understanding of the population of low-mass massive black holes a top scientific priority. ...
Slide 1
... It explains cosmic microwave background observations, as well as large scale structure observations and supernova observations of the accelerating expansion of the universe. Cold Dark Matter is explained as being cold its velocity is non-relativistic (v<
... It explains cosmic microwave background observations, as well as large scale structure observations and supernova observations of the accelerating expansion of the universe. Cold Dark Matter is explained as being cold its velocity is non-relativistic (v<
Neutron Stars PowerPoint
... • Discovered in 1971 by the Uhuru spacecraft – High-energy pulsars are in close binary systems • Deduced from cyclical Doppler shift every 1.7 days • Pulsing period of ~ 1.24 seconds ...
... • Discovered in 1971 by the Uhuru spacecraft – High-energy pulsars are in close binary systems • Deduced from cyclical Doppler shift every 1.7 days • Pulsing period of ~ 1.24 seconds ...
Nuclear Nomenclature
... rivals the energy output of all the stars in all the galaxies of the visible universe! The energy emitted in neutrinos within a few seconds in a supernova is more than 300 times the total light output of a solar-like star during its entire life! ...
... rivals the energy output of all the stars in all the galaxies of the visible universe! The energy emitted in neutrinos within a few seconds in a supernova is more than 300 times the total light output of a solar-like star during its entire life! ...
NGC 3370 Spiral Galaxy - University of Kentucky
... pulsation die away. • Neutron stars only live in the pulsar phase for a couple hundred thousand years (~200,000 years) • Where would you expect the majority of the pulsars to be found in our Galaxy? ...
... pulsation die away. • Neutron stars only live in the pulsar phase for a couple hundred thousand years (~200,000 years) • Where would you expect the majority of the pulsars to be found in our Galaxy? ...
Review: How does a star`s mass determine its life story?
... • How were neutron stars discovered? • Neutron stars spin rapidly when they are born, and their strong magnetic fields can direct beams of radiation that sweep through space as the neutron star spins. We see such neutron stars as pulsars, and these pulsars provided the first direct evidence for the ...
... • How were neutron stars discovered? • Neutron stars spin rapidly when they are born, and their strong magnetic fields can direct beams of radiation that sweep through space as the neutron star spins. We see such neutron stars as pulsars, and these pulsars provided the first direct evidence for the ...
An Analysis of the Behavior of Vela X-1
... compact object is ~283 seconds and it is not changing. – The compact object is a neutron star based on its luminosity (from the energy spectrum flux) of ~1036 ergs sec-1 – It is a pulsar because it is in a MXRB and has a Power law Model fit. Literature support: Kretschmar, 2004, Charles and Seward, ...
... compact object is ~283 seconds and it is not changing. – The compact object is a neutron star based on its luminosity (from the energy spectrum flux) of ~1036 ergs sec-1 – It is a pulsar because it is in a MXRB and has a Power law Model fit. Literature support: Kretschmar, 2004, Charles and Seward, ...
How the quasars (lower right) are different than brown dwarfs
... compared to normal starforming galaxies like the two spiral galaxies. That is why Arp 220 belongs to the class of ultra-luminous infrared galaxies. ...
... compared to normal starforming galaxies like the two spiral galaxies. That is why Arp 220 belongs to the class of ultra-luminous infrared galaxies. ...
AY 12 Homework #4 Solutions Winter 2016 Longer Problems 1. a
... f) A star cannot become arbitrarily large. At around 150 M , the radiation pressure in the star becomes so great as to overcome gravity and blow the star apart. Thus, a star above 150 M cannot exist. 5. A Type II supernova would occur first in a cluster of stars. This is because Type II supernovae ...
... f) A star cannot become arbitrarily large. At around 150 M , the radiation pressure in the star becomes so great as to overcome gravity and blow the star apart. Thus, a star above 150 M cannot exist. 5. A Type II supernova would occur first in a cluster of stars. This is because Type II supernovae ...
Friday, April 26
... • Implosion of a white dwarf after it accretes a certain amount of matter, reaching about ...
... • Implosion of a white dwarf after it accretes a certain amount of matter, reaching about ...
L. Moustakas
... ~50% of jk galaxies would be missed by R-limit, but not by z-limit The implied X-ray and (uncorrected) UV SFRr are comparable The pure AGN fraction is similar; it may be higher for jk galaxies ...
... ~50% of jk galaxies would be missed by R-limit, but not by z-limit The implied X-ray and (uncorrected) UV SFRr are comparable The pure AGN fraction is similar; it may be higher for jk galaxies ...
SGR and AXP – are they magnetars?
... Rotation energy losses are much less than observed (magnetic ?), so B estimations using dP/dt are not justified: Magnetic stellar wind as a mechanism of angular ...
... Rotation energy losses are much less than observed (magnetic ?), so B estimations using dP/dt are not justified: Magnetic stellar wind as a mechanism of angular ...
Ejecta from neutron star mergers and the role of
... IKP-Theorie, TU-Darmstadt, Darmstadt, Germany ...
... IKP-Theorie, TU-Darmstadt, Darmstadt, Germany ...
Astrophysical X-ray source
Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays.There are a number of types of astrophysical objects which emit X-rays, from galaxy clusters, through black holes in active galactic nuclei (AGN) to galactic objects such as supernova remnants, stars, and binary stars containing a white dwarf (cataclysmic variable stars and super soft X-ray sources), neutron star or black hole (X-ray binaries). Some solar system bodies emit X-rays, the most notable being the Moon, although most of the X-ray brightness of the Moon arises from reflected solar X-rays. A combination of many unresolved X-ray sources is thought to produce the observed X-ray background. The X-ray continuum can arise from bremsstrahlung, either magnetic or ordinary Coulomb, black-body radiation, synchrotron radiation, inverse Compton scattering of lower-energy photons be relativistic electrons, knock-on collisions of fast protons with atomic electrons, and atomic recombination, with or without additional electron transitions.Furthermore, celestial entities in space are discussed as celestial X-ray sources. The origin of all observed astronomical X-ray sources is in, near to, or associated with a coronal cloud or gas at coronal cloud temperatures for however long or brief a period.