Spectral-Type Trends: Absorption
... The winds of massive stars deposit chemically enriched matter as well as momentum and energy into their galactic environment (wind-blown bubble XXX at left). The X-rays are produced very close to the stars, however, necessitating the use of spectroscopy of the unresolved central stars in order to u ...
... The winds of massive stars deposit chemically enriched matter as well as momentum and energy into their galactic environment (wind-blown bubble XXX at left). The X-rays are produced very close to the stars, however, necessitating the use of spectroscopy of the unresolved central stars in order to u ...
Life Cycle of STARS
... • Stars lose material through nuclear fusion, over billions of years. • Sometimes they lose material REALLY FAST! ...
... • Stars lose material through nuclear fusion, over billions of years. • Sometimes they lose material REALLY FAST! ...
X-ray heating of the chromosphere
... c) There are significant differences in height in the chromosphere between the layers where the core of H line profile is formed and the layers where deposited energy reach the maximum. In such a case the intensities of central parts of H line profiles should not be close related with the rates of ...
... c) There are significant differences in height in the chromosphere between the layers where the core of H line profile is formed and the layers where deposited energy reach the maximum. In such a case the intensities of central parts of H line profiles should not be close related with the rates of ...
Cosmic Feedback from Supermassive Black Holes
... Feedback and galaxy formation Every massive galaxy appears to have a massive black hole at its center whose mass is about 0.2% of the mass of the galaxy's bulge (Tremaine et al. 2002). It is now widely considered that the black hole may have brought about this correlation by regulating the amount of ...
... Feedback and galaxy formation Every massive galaxy appears to have a massive black hole at its center whose mass is about 0.2% of the mass of the galaxy's bulge (Tremaine et al. 2002). It is now widely considered that the black hole may have brought about this correlation by regulating the amount of ...
Lecture 19 Review
... M > 8MSun Further burning produces iron. The slow neutron process produces some heavy elements. There are no more fusion processes. Beyond this point it takes energy to make a heavier element. At this point gravitational collapse occurs followed by a catastrophic rebound. A fast neutron process pro ...
... M > 8MSun Further burning produces iron. The slow neutron process produces some heavy elements. There are no more fusion processes. Beyond this point it takes energy to make a heavier element. At this point gravitational collapse occurs followed by a catastrophic rebound. A fast neutron process pro ...
The Chandra Orion Ultradeep Project Eric Feigelson
... Even these weak COUP flares are ~10x stronger than the most powerful flares from the contemporary Sun. ...
... Even these weak COUP flares are ~10x stronger than the most powerful flares from the contemporary Sun. ...
PowerPoint - Astronomy at Swarthmore College
... rotator, 1 Ori C (O6 V), corresponding to four different viewing angles with respect to the magnetic axis, are used to constrain the temperature, spatial location, and kinematics of the hot plasma on this very young hot star with a strong (1100 G) dipole field. The plasma is moving, but only at spe ...
... rotator, 1 Ori C (O6 V), corresponding to four different viewing angles with respect to the magnetic axis, are used to constrain the temperature, spatial location, and kinematics of the hot plasma on this very young hot star with a strong (1100 G) dipole field. The plasma is moving, but only at spe ...
Ten Years Of XMM-Newton: Scientific Achievements And Future Prospects Norbert Schartel
... • Filament connecting the clusters of galaxies A 222 and A 223 (z = 0.21) has been previously detected using weak lensing data Detection of the filament in the soft-band X-rays with a 5σ with kT = 0.91±0.25 keV Baryon over-density of ρ/<ρC> ≈150, which is consistent with expectations for the den ...
... • Filament connecting the clusters of galaxies A 222 and A 223 (z = 0.21) has been previously detected using weak lensing data Detection of the filament in the soft-band X-rays with a 5σ with kT = 0.91±0.25 keV Baryon over-density of ρ/<ρC> ≈150, which is consistent with expectations for the den ...
Notes
... Sometimes: _____________________-emitting jets VIII Gamma-Ray Bursts (GRBs) Short (~ a few s), bright bursts of _________________________________ Later discovered with X-ray and optical afterglows lasting several hours – a few days Many have now been associated with host ____________________ ...
... Sometimes: _____________________-emitting jets VIII Gamma-Ray Bursts (GRBs) Short (~ a few s), bright bursts of _________________________________ Later discovered with X-ray and optical afterglows lasting several hours – a few days Many have now been associated with host ____________________ ...
$doc.title
... • As a stellar core collapses, in conserves its angular momentum. This gives the pulsar their rapid spin • Magnetic field is also retained and compressed, accelerating electrons, which emit synchrotron radiation • Magnetic poles need not be aligned with the rotation axis. Thus, the beams of radia ...
... • As a stellar core collapses, in conserves its angular momentum. This gives the pulsar their rapid spin • Magnetic field is also retained and compressed, accelerating electrons, which emit synchrotron radiation • Magnetic poles need not be aligned with the rotation axis. Thus, the beams of radia ...
Space Science Chapter 4 Reading Guide BIG IDEA: Our Sun is
... 8. Why are star systems important to astronomers? Section 3 :Galaxies have different sizes and shapes 1. The Milky Way is shaped like a disk with a _________________________ in the center. ...
... 8. Why are star systems important to astronomers? Section 3 :Galaxies have different sizes and shapes 1. The Milky Way is shaped like a disk with a _________________________ in the center. ...
Introduction to Astronomy
... • A white dwarf is nothing more than the leftover core of a low-mass star (few x MSun) – During red giant phase, outer layers are blown off • Radiation pressure ...
... • A white dwarf is nothing more than the leftover core of a low-mass star (few x MSun) – During red giant phase, outer layers are blown off • Radiation pressure ...
Neutron Stars
... Upper mass limit of Neutron Stars • In Neutron stars the gravity is balanced by two forces. – Degenerate neutron pressure – Strong nuclear force. ...
... Upper mass limit of Neutron Stars • In Neutron stars the gravity is balanced by two forces. – Degenerate neutron pressure – Strong nuclear force. ...
Astronomy Astrophysics + Infrared identification of 2XMM J191043.4
... the H-band spectrum prevented us from identifying hydrogen lines such as Br10, Br11, or Br12, and/or helium lines like He ii 1.6918 μm or He i 1.7002 μm clearly. Other hydrogen lines are not detected, probably because their intensities would be below the continuum noise level. On the other hand, coo ...
... the H-band spectrum prevented us from identifying hydrogen lines such as Br10, Br11, or Br12, and/or helium lines like He ii 1.6918 μm or He i 1.7002 μm clearly. Other hydrogen lines are not detected, probably because their intensities would be below the continuum noise level. On the other hand, coo ...
15-3
... of a very massive star • 5 times the mass of the sun packed into a sphere the size of a marble • Gravity so strong nothing, not even light, can escape • Quasars are black holes millions of light years away that shine very bright (galaxies with black holes in the center) ...
... of a very massive star • 5 times the mass of the sun packed into a sphere the size of a marble • Gravity so strong nothing, not even light, can escape • Quasars are black holes millions of light years away that shine very bright (galaxies with black holes in the center) ...
Stellar Death High Mass Stars
... Gravity balanced by strong nuclear force R = 10 km Very Faint ...
... Gravity balanced by strong nuclear force R = 10 km Very Faint ...
14-black-holes
... • What is the life cycle of a low mass star (<8 solar masses when on the main sequence)? • What is the life cycle of a high mass star (>8 solar masses when on the main sequence)? • After a supernova, what are the two fates of the core of the star? • What determines whether the core will be a neutron ...
... • What is the life cycle of a low mass star (<8 solar masses when on the main sequence)? • What is the life cycle of a high mass star (>8 solar masses when on the main sequence)? • After a supernova, what are the two fates of the core of the star? • What determines whether the core will be a neutron ...
PG_Lecture_Dec18_2008
... Atmospheres of “active” stars and the Sun Flare stars and the Sun have hot atmospheres, usually a corona (temperature ~ 106 K) plus a chromosphere (~10,000 K) and “transition region” (~105 K). These temperatures are generally much hotter than their surface temperatures. E.g. The Sun has surface (ph ...
... Atmospheres of “active” stars and the Sun Flare stars and the Sun have hot atmospheres, usually a corona (temperature ~ 106 K) plus a chromosphere (~10,000 K) and “transition region” (~105 K). These temperatures are generally much hotter than their surface temperatures. E.g. The Sun has surface (ph ...
Lecture 19
... Might be normal matter in a form that doesn’t emit much light – very small and dim star, little black holes • More likely it is elementary particles other than normal matter ...
... Might be normal matter in a form that doesn’t emit much light – very small and dim star, little black holes • More likely it is elementary particles other than normal matter ...
Dead Stars - University of Iowa Astrophysics
... Last time: theoretical physics says that the present-day core of the Sun will eventually become an incredibly compact, incredibly dense white dwarf ...
... Last time: theoretical physics says that the present-day core of the Sun will eventually become an incredibly compact, incredibly dense white dwarf ...
Dead Stars They do exist! The white dwarf stars
... Last time: theoretical physics says that the present-day core of the Sun will eventually become an incredibly compact, incredibly dense white dwarf ...
... Last time: theoretical physics says that the present-day core of the Sun will eventually become an incredibly compact, incredibly dense white dwarf ...
The Super-slow Pulsation X-ray Pulsars in High Mass X
... • If 4U 2206+54/SXP 1062 continue to spin down, spin period is longer than 10000 s within few hundred years; • 4U 2206+54 may undergo transition to spin-up channel in future like 2S 0114+65; • The possible progenitor of B1 supergiant in 2S 0114+65 is O9.5V star (main-sequence star type in 4U 2206+5 ...
... • If 4U 2206+54/SXP 1062 continue to spin down, spin period is longer than 10000 s within few hundred years; • 4U 2206+54 may undergo transition to spin-up channel in future like 2S 0114+65; • The possible progenitor of B1 supergiant in 2S 0114+65 is O9.5V star (main-sequence star type in 4U 2206+5 ...
White dwarfs - University of Toronto
... see the papers in Nature (vol 443, p 283 and p 308) A Type Ia supernova more than twice as bright as others of its type has been observed, suggesting it arose from a star that managed to grow more massive than the Chandrasekhar limit. This mass cut-off was thought to make all such supernovae explode ...
... see the papers in Nature (vol 443, p 283 and p 308) A Type Ia supernova more than twice as bright as others of its type has been observed, suggesting it arose from a star that managed to grow more massive than the Chandrasekhar limit. This mass cut-off was thought to make all such supernovae explode ...
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.