chapter18StarDeath
... what would happen if a star orbiting in a direction opposite the neutron’s star rotation fell onto a neutron star? A. The neutron star’s rotation would speed up. B. The neutron star’s rotation would slow down. C. Nothing, the directions would cancel each other ...
... what would happen if a star orbiting in a direction opposite the neutron’s star rotation fell onto a neutron star? A. The neutron star’s rotation would speed up. B. The neutron star’s rotation would slow down. C. Nothing, the directions would cancel each other ...
Chapter 18 The Bizarre Stellar Graveyard What is a white dwarf
... – A ball of neutrons left over from a massive star supernova and supported by neutron degeneracy pressure ...
... – A ball of neutrons left over from a massive star supernova and supported by neutron degeneracy pressure ...
POISE AND EVOLUTION OF THE GALAXY : STRUCTURE ,
... which might be at the origin of phenomena in astronomy as quizzical as the mysteriously intensely radiating “QUASARS”, that basic astrophysics cannot easily interpret through usual frames. That might be, as well, some origin of the elusive “dark energy”, if not of the unaccountable “dark mass”, acco ...
... which might be at the origin of phenomena in astronomy as quizzical as the mysteriously intensely radiating “QUASARS”, that basic astrophysics cannot easily interpret through usual frames. That might be, as well, some origin of the elusive “dark energy”, if not of the unaccountable “dark mass”, acco ...
The Swift satellite lives up to its name, revealing cosmic
... The old saying ‘the early bird catches the worm’ is never more true than when studying the most powerful explosions in the Universe - Gamma-ray Bursts. These monster events - second only to the Big Bang in energy release - are occurring every day all across the Universe, and were discovered accident ...
... The old saying ‘the early bird catches the worm’ is never more true than when studying the most powerful explosions in the Universe - Gamma-ray Bursts. These monster events - second only to the Big Bang in energy release - are occurring every day all across the Universe, and were discovered accident ...
AST1100 Lecture Notes
... dwarfs, stars with radii similar to the Earth. These are dead and compact stars which have stopped energy production by nuclear fusion and are slowly becoming colder and colder. In the lectures on stellar evolution we will come back to why stars are not randomly distributed in a HR-diagram and why t ...
... dwarfs, stars with radii similar to the Earth. These are dead and compact stars which have stopped energy production by nuclear fusion and are slowly becoming colder and colder. In the lectures on stellar evolution we will come back to why stars are not randomly distributed in a HR-diagram and why t ...
AST1100 Lecture Notes
... dwarfs, stars with radii similar to the Earth. These are dead and compact stars which have stopped energy production by nuclear fusion and are slowly becoming colder and colder. In the lectures on stellar evolution we will come back to why stars are not randomly distributed in a HR-diagram and why t ...
... dwarfs, stars with radii similar to the Earth. These are dead and compact stars which have stopped energy production by nuclear fusion and are slowly becoming colder and colder. In the lectures on stellar evolution we will come back to why stars are not randomly distributed in a HR-diagram and why t ...
The Argonauts, background to the constellation Carina Argo Navis
... The Argonauts, background to the constellation Carina Argo Navis (or simply Argo) was a very large constellation in the southern sky that has since been divided into three constellations. It represented the Argo, the ship used by Jason and the Argonauts in Greek mythology. Argo Navis is the only one ...
... The Argonauts, background to the constellation Carina Argo Navis (or simply Argo) was a very large constellation in the southern sky that has since been divided into three constellations. It represented the Argo, the ship used by Jason and the Argonauts in Greek mythology. Argo Navis is the only one ...
Slide 1
... our best estimates are around 9 billion years. To compare, our estimates for the Universe are that it is around 13 billion years old. So the Milky Way has been around for most of the life of the Universe. ...
... our best estimates are around 9 billion years. To compare, our estimates for the Universe are that it is around 13 billion years old. So the Milky Way has been around for most of the life of the Universe. ...
Measuring Astronomical Distances
... those who dared to believe the universe was larger than they could fathom, we wouldn’t be able to study ...
... those who dared to believe the universe was larger than they could fathom, we wouldn’t be able to study ...
Stellar Lives (continued). Galaxies.
... In massive stars the core temperature can reach the critical 600 million K to ignite carbon. But carbon burns away in a few hundred years. Each successive stage of nuclear burning proceeds more rapidly than prior stages. Many different reactions may act at the same time. At the end of a massive star ...
... In massive stars the core temperature can reach the critical 600 million K to ignite carbon. But carbon burns away in a few hundred years. Each successive stage of nuclear burning proceeds more rapidly than prior stages. Many different reactions may act at the same time. At the end of a massive star ...
Betelgeuse
... and the narrow bandwidth avoids any spectral lines, and so we see the star relatively undistorted," said Townes. "We have also had the good fortune to have an instrument that has operated in a very similar manner for some 15 years, providing a long and consistent series of measurements that no one e ...
... and the narrow bandwidth avoids any spectral lines, and so we see the star relatively undistorted," said Townes. "We have also had the good fortune to have an instrument that has operated in a very similar manner for some 15 years, providing a long and consistent series of measurements that no one e ...
Chapter 8 Pre-galactic enrichment of the IGM 8.1 Summary
... is equal to XC = 0.027, which is taken from the supernovae metal yield of a massive primordial star of approximately 260 M! as computed by Heger et al. [?]. We then compute the mean and median carbon metallicity, [C/H] = log (nC /nH )−[C/H]! (where [C/H]! = −3.45) in bins of constant logarithmic ove ...
... is equal to XC = 0.027, which is taken from the supernovae metal yield of a massive primordial star of approximately 260 M! as computed by Heger et al. [?]. We then compute the mean and median carbon metallicity, [C/H] = log (nC /nH )−[C/H]! (where [C/H]! = −3.45) in bins of constant logarithmic ove ...
Chapter 12 Stellar Evolution
... • A supernova is incredibly luminous, as can be seen from these curves—more than a million times as bright as a nova. ...
... • A supernova is incredibly luminous, as can be seen from these curves—more than a million times as bright as a nova. ...
What is a white dwarf?
... that nothing can move faster than light. [The speed of limit is the same relative to all observers.] When electron speeds in a white dwarf approach the speed of light, electron degeneracy pressure can no longer support the white dwarf. ...
... that nothing can move faster than light. [The speed of limit is the same relative to all observers.] When electron speeds in a white dwarf approach the speed of light, electron degeneracy pressure can no longer support the white dwarf. ...
A historical perspective on the discovery of neutron stars
... Search for a neutron star in the Crab nebula The Crab nebula was observed during a lunar occultation on 7 July 1964. The size of the X-ray source was estimated as 1 light-year∼ 1013 km (size of the nebula 11 ly). This was much larger than the typical size of a neutron star (10-20 km). In 1965 Antho ...
... Search for a neutron star in the Crab nebula The Crab nebula was observed during a lunar occultation on 7 July 1964. The size of the X-ray source was estimated as 1 light-year∼ 1013 km (size of the nebula 11 ly). This was much larger than the typical size of a neutron star (10-20 km). In 1965 Antho ...
Ch12&13 Life and Death of Stars
... • Things get interesting after about 9 billion years…. • A star remains on the main sequence as long as it can fuse hydrogen into helium in its core ...
... • Things get interesting after about 9 billion years…. • A star remains on the main sequence as long as it can fuse hydrogen into helium in its core ...
Paper - Astrophysics - University of Oxford
... number of stars that have formed - the rate of "core-collapse" Supernovae (those of types II and Ib/c) gives a direct measurement of the death rate of stars more massive than 8 solar masses, and thermonuclear supernovae (Type Ia) are the result of the death of moderate mass stars (3-8 solar masses). ...
... number of stars that have formed - the rate of "core-collapse" Supernovae (those of types II and Ib/c) gives a direct measurement of the death rate of stars more massive than 8 solar masses, and thermonuclear supernovae (Type Ia) are the result of the death of moderate mass stars (3-8 solar masses). ...
AST1100 Lecture Notes
... luminosities. These are white dwarfs, stars with radii similar to the Earth. These are dead and compact stars which have stopped energy production by nuclear fusion and are slowly becoming colder and colder. In the lectures on stellar evolution we will come back to why stars are not randomly distrib ...
... luminosities. These are white dwarfs, stars with radii similar to the Earth. These are dead and compact stars which have stopped energy production by nuclear fusion and are slowly becoming colder and colder. In the lectures on stellar evolution we will come back to why stars are not randomly distrib ...
Chapter 12 Star Stuff How do stars form?
... “bounce” when neutron degeneracy pressure kicks in drives outer layers into space Left behind is either a neutron star or, if the core is massive enough to “break” the neutron degeneracy pressure, a black hole The outer envelope of the star moves out into space, forming a nebula The Crab Nebula is t ...
... “bounce” when neutron degeneracy pressure kicks in drives outer layers into space Left behind is either a neutron star or, if the core is massive enough to “break” the neutron degeneracy pressure, a black hole The outer envelope of the star moves out into space, forming a nebula The Crab Nebula is t ...
Galaxies – Island universes
... for every additional megaparsec further out you look • Now we have our final rung in the Distance Ladder: Solve for D and get D=V/H ...
... for every additional megaparsec further out you look • Now we have our final rung in the Distance Ladder: Solve for D and get D=V/H ...
printer-friendly version of benchmark
... stellar remnant (e.g., a neutron star or black hole). Specifically, these massive stars will end as a Type II supernova. In massive stars, their stellar core mass is about 1.4 MSun, a value known as the Chandraskhkar Limit. At the end of the star’s life, when stellar fusion ceases suddenly, core mas ...
... stellar remnant (e.g., a neutron star or black hole). Specifically, these massive stars will end as a Type II supernova. In massive stars, their stellar core mass is about 1.4 MSun, a value known as the Chandraskhkar Limit. At the end of the star’s life, when stellar fusion ceases suddenly, core mas ...
Reach for the Stars – Div. B
... sources seen from Earth, 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. ...
... sources seen from Earth, 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. ...
Transcript - Chandra X
... and ignite a Type Ia supernova event. This observation was obtained using the Very Large Telescope (VLT) at the Paranal Observatory in Chile. The second image is an artist illustration. Slide 12: This Hubble image shows Henize 3-1357 (Hen 3-1357), which is also known as the Stingray Nebula. The Stin ...
... and ignite a Type Ia supernova event. This observation was obtained using the Very Large Telescope (VLT) at the Paranal Observatory in Chile. The second image is an artist illustration. Slide 12: This Hubble image shows Henize 3-1357 (Hen 3-1357), which is also known as the Stingray Nebula. The Stin ...
Exploring the Variable Sky with the Catalina Real-Time
... mine that data set. Light curves are generated on demand for transient sources, blazars, etc. ...
... mine that data set. Light curves are generated on demand for transient sources, blazars, etc. ...
History of supernova observation
The known history of supernova observation goes back to 185 CE, when, supernova SN 185 appeared, the oldest appearance of a supernova recorded by humankind. Several additional supernovae within the Milky Way galaxy have been recorded since that time, with SN 1604 being the most recent supernova to be observed in this galaxy.Since the development of the telescope, the field of supernova discovery has expanded to other galaxies. These occurrences provide important information on the distances of galaxies. Successful models of supernova behavior have also been developed, and the role of supernovae in the star formation process is now increasingly understood.