supernova remnants: a link between massive stars and the
... (1) SN IIP: they are type II SN whose light curve has a plateau. The presence of a plateau in the light decay implies a massive hydrogen envelope. These SNe are the end point of red supergiants (RSG) with relatively low mass-loss rates; they probably come from a single star with a mass of ∼ 10 to 15 ...
... (1) SN IIP: they are type II SN whose light curve has a plateau. The presence of a plateau in the light decay implies a massive hydrogen envelope. These SNe are the end point of red supergiants (RSG) with relatively low mass-loss rates; they probably come from a single star with a mass of ∼ 10 to 15 ...
Lec10_ch12_deathofstars
... • What’s left after a type II supernova – for stars of mass of 8-25 Msun, when core collapses and electron combine with protons, we are left with a neutron core--a neutron star! – Core about 10-20 km in diameter! – Gas layers completely blown away ...
... • What’s left after a type II supernova – for stars of mass of 8-25 Msun, when core collapses and electron combine with protons, we are left with a neutron core--a neutron star! – Core about 10-20 km in diameter! – Gas layers completely blown away ...
PDF format
... b) True, neutron stars had been observed before at optical wavelengths but it was only after they were found to pulsate at radio wavelengths that astronomers realized their nature. c) False, the existence of neutron stars was predicted by theory and it was widely accepted that they were common in ...
... b) True, neutron stars had been observed before at optical wavelengths but it was only after they were found to pulsate at radio wavelengths that astronomers realized their nature. c) False, the existence of neutron stars was predicted by theory and it was widely accepted that they were common in ...
THE SHAPES OF ATOMIC LINES FROM THE SURFACES OF
... the rotational equator or rotationally confined thermonuclear burning), or a combination. Emission from a localized region that is not at the rotation pole is effectively smeared into an axisymmetric belt when averaged over many spin periods. This is to be expected for the spin frequencies k10 Hz of ...
... the rotational equator or rotationally confined thermonuclear burning), or a combination. Emission from a localized region that is not at the rotation pole is effectively smeared into an axisymmetric belt when averaged over many spin periods. This is to be expected for the spin frequencies k10 Hz of ...
Discover - Astronomy Magazine
... far beyond the solar system, where nearly all tests so far have occurred. They aim to detect how gravity behaves in the highly warped regions of space-time near superdense collapsed stars called pulsars. These extreme objects advertise their presence with intense beams of radiation, sweeping through ...
... far beyond the solar system, where nearly all tests so far have occurred. They aim to detect how gravity behaves in the highly warped regions of space-time near superdense collapsed stars called pulsars. These extreme objects advertise their presence with intense beams of radiation, sweeping through ...
Kick velocity
... Will a NS start to accrete from the ISM, or will it stay as Ejector, or Propeller, or will in enter another regime strongly depends on the relative velocity of a NS and the ISM. ...
... Will a NS start to accrete from the ISM, or will it stay as Ejector, or Propeller, or will in enter another regime strongly depends on the relative velocity of a NS and the ISM. ...
Kick velocity
... Will a NS start to accrete from the ISM, or will it stay as Ejector, or Propellor, or will in enter another regime strongly depends on the relative velocity of a NS and the ISM. ...
... Will a NS start to accrete from the ISM, or will it stay as Ejector, or Propellor, or will in enter another regime strongly depends on the relative velocity of a NS and the ISM. ...
Far Ultraviolet Spectroscopic Explorer
... Search data set for interesting individual objects that represent rare classes of objects. ...
... Search data set for interesting individual objects that represent rare classes of objects. ...
Far Ultraviolet Spectroscopic Explorer
... Search data set for interesting individual objects that represent rare classes of objects. ...
... Search data set for interesting individual objects that represent rare classes of objects. ...
G030338-00 - DCC
... 90% confidence upper limit: inspiral rate < 170/year per Milky-way equivalent galaxy, in the (m1, m2) range of 1 to 3 solar masses. LIGO-G030338-00-R ...
... 90% confidence upper limit: inspiral rate < 170/year per Milky-way equivalent galaxy, in the (m1, m2) range of 1 to 3 solar masses. LIGO-G030338-00-R ...
Today in Astronomy 142
... When stars form, they contract until they are hot enough in the center (about 3×106 K) to ignite the pp-chain fusion reactions. Recall that ...
... When stars form, they contract until they are hot enough in the center (about 3×106 K) to ignite the pp-chain fusion reactions. Recall that ...
Stellivore Extraterrestrials? Binary Stars as Living Systems
... on the four fundamental physical interactions: strong nuclear, electromagnetic, weak nuclear, and gravitational. Starting with such universal metabolic considerations, it follows that the substrate on which life or complex systems are based needs not to be unique. For example, our computers' substra ...
... on the four fundamental physical interactions: strong nuclear, electromagnetic, weak nuclear, and gravitational. Starting with such universal metabolic considerations, it follows that the substrate on which life or complex systems are based needs not to be unique. For example, our computers' substra ...
AST1100 Lecture Notes
... nuclei (Fe) and electrons. Interior to this crust the material is comprised mostly of neutrons, with a small percentage of protons and electrons as well. At a sufficiently deep level the neutron density may become high enough to give rise to exotic physical phenomena such as super-fluidity and perha ...
... nuclei (Fe) and electrons. Interior to this crust the material is comprised mostly of neutrons, with a small percentage of protons and electrons as well. At a sufficiently deep level the neutron density may become high enough to give rise to exotic physical phenomena such as super-fluidity and perha ...
AST1100 Lecture Notes
... nuclei (Fe) and electrons. Interior to this crust the material is comprised mostly of neutrons, with a small percentage of protons and electrons as well. At a sufficiently deep level the neutron density may become high enough to give rise to exotic physical phenomena such as super-fluidity and perha ...
... nuclei (Fe) and electrons. Interior to this crust the material is comprised mostly of neutrons, with a small percentage of protons and electrons as well. At a sufficiently deep level the neutron density may become high enough to give rise to exotic physical phenomena such as super-fluidity and perha ...
How we found about BLACK HOLES
... A, but it would be quite bright just the same. Since Sirius B is even hotter than our Sun, it should shine at that distance even more brightly than the Sun—yet it does not. Sirius B shines with only 1/400 the brightness that our Sun would show if it was at that the same distance. How is that possibl ...
... A, but it would be quite bright just the same. Since Sirius B is even hotter than our Sun, it should shine at that distance even more brightly than the Sun—yet it does not. Sirius B shines with only 1/400 the brightness that our Sun would show if it was at that the same distance. How is that possibl ...
Burst Oscillations and Nonradial Modes on Neutron Stars
... • Non-pulsars only show oscillations in short (~ 2-10 s) bursts, while pulsars have shown oscillations in longer bursts (~ 100 s) • Non-pulsars show frequency drifts often late into cooling tail, while pulsars show no frequency evolution after burst peak • Non-pulsars have highly sinusoidal oscillat ...
... • Non-pulsars only show oscillations in short (~ 2-10 s) bursts, while pulsars have shown oscillations in longer bursts (~ 100 s) • Non-pulsars show frequency drifts often late into cooling tail, while pulsars show no frequency evolution after burst peak • Non-pulsars have highly sinusoidal oscillat ...
New Mechanism of Pulsar Radio Emission
... Since the discovery of pulsars in 1967, the mechanism of generation of their highly nonthermal (brightness temperatures up to 1029 K) pulsed radio emission (in the range 108 1011 Hz) remains one of the most intriguing astrophysical puzzles [1]. Compact sizes (radius Rp ⬃ 106 cm), fast rotation (peri ...
... Since the discovery of pulsars in 1967, the mechanism of generation of their highly nonthermal (brightness temperatures up to 1029 K) pulsed radio emission (in the range 108 1011 Hz) remains one of the most intriguing astrophysical puzzles [1]. Compact sizes (radius Rp ⬃ 106 cm), fast rotation (peri ...
Astrophysics Questions (DRAFT)
... evolution. What stars leave (i) white dwarfs, (ii) neutron stars, or (iii) black holes? 58. What is a white dwarf star? Why is the radius of a white dwarf a decreasing function of its mass? What is the basic physics that leads to the upper limit on the mass of a white dwarf (i.e., the Chandrasekhar ...
... evolution. What stars leave (i) white dwarfs, (ii) neutron stars, or (iii) black holes? 58. What is a white dwarf star? Why is the radius of a white dwarf a decreasing function of its mass? What is the basic physics that leads to the upper limit on the mass of a white dwarf (i.e., the Chandrasekhar ...
Small Wonders: Taurus
... and high contrast. When embarked on your own investigation into the Pleiades nebulosity use low powers. Pay careful attention to the area around Merope - where the brightest swatch of nebula resides (the Merope Nebula). On a good night you may see nebulosity throughout the cluster. Be aware that a s ...
... and high contrast. When embarked on your own investigation into the Pleiades nebulosity use low powers. Pay careful attention to the area around Merope - where the brightest swatch of nebula resides (the Merope Nebula). On a good night you may see nebulosity throughout the cluster. Be aware that a s ...
SM_Taurus - Cloudy Nights
... and high contrast. When embarked on your own investigation into the Pleiades nebulosity use low powers. Pay careful attention to the area around Merope - where the brightest swatch of nebula resides (the Merope Nebula). On a good night you may see nebulosity throughout the cluster. Be aware that a s ...
... and high contrast. When embarked on your own investigation into the Pleiades nebulosity use low powers. Pay careful attention to the area around Merope - where the brightest swatch of nebula resides (the Merope Nebula). On a good night you may see nebulosity throughout the cluster. Be aware that a s ...
The Death of a Star
... Pulsar at center of Crab Nebula pulses 30 times per second Search for radio waves ...
... Pulsar at center of Crab Nebula pulses 30 times per second Search for radio waves ...
1B11 Foundations of Astronomy Star names and magnitudes
... • apparent magnitude – the brightness that a star has on the sky as seen by an observer from Earth. Logarithmic scale defined by Pogson. ...
... • apparent magnitude – the brightness that a star has on the sky as seen by an observer from Earth. Logarithmic scale defined by Pogson. ...
AST1100 Lecture Notes
... the collapse is suddenly stopped, the core bounces back and an energetic shock wave is generated. This shock wave travels outwards from the core but is blocked by the massive and dense ’iron cap’, the outer core, which is in free fall towards the inner core. The energy of the shock wave heats the ou ...
... the collapse is suddenly stopped, the core bounces back and an energetic shock wave is generated. This shock wave travels outwards from the core but is blocked by the massive and dense ’iron cap’, the outer core, which is in free fall towards the inner core. The energy of the shock wave heats the ou ...
astro-ph/9410035 PDF
... parts of the star.2 Both regimes may occur in a real neutron star, depending on its history and on the uncertain properties of neutron star matter. The rst is more likely if a super uid is present (which inhibits reactions by reducing the available phase space, and probably also facilitates relativ ...
... parts of the star.2 Both regimes may occur in a real neutron star, depending on its history and on the uncertain properties of neutron star matter. The rst is more likely if a super uid is present (which inhibits reactions by reducing the available phase space, and probably also facilitates relativ ...
strolympics - Chandra X
... Olympics, where the difference between gold and silver can be a fraction of a second. However, everyday technologies like GPS require even more precision. Time and our ability to measure it accurately is also key for many frontiers of science, including astrophysics. The Chandra X-ray Observatory ha ...
... Olympics, where the difference between gold and silver can be a fraction of a second. However, everyday technologies like GPS require even more precision. Time and our ability to measure it accurately is also key for many frontiers of science, including astrophysics. The Chandra X-ray Observatory ha ...
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.