Supernova - Wikipedia, the free encyclopedia
... Supernovae in other galaxies cannot be predicted with any meaningful accuracy. Normally, when they are discovered, they are already in progress.[25] Most scientific interest in supernovae—as standard candles for measuring distance, for example—require an observation of their peak luminosity. It is t ...
... Supernovae in other galaxies cannot be predicted with any meaningful accuracy. Normally, when they are discovered, they are already in progress.[25] Most scientific interest in supernovae—as standard candles for measuring distance, for example—require an observation of their peak luminosity. It is t ...
Document
... class of variables because it was: – Among one of the brightest members of the new class – The best studied of the sample – Showed a good range of the absorption/emission features used to characterize the set of stars ...
... class of variables because it was: – Among one of the brightest members of the new class – The best studied of the sample – Showed a good range of the absorption/emission features used to characterize the set of stars ...
Power Point Presentation
... Cosmology Professor Lynn Cominsky Department of Physics and Astronomy Offices: Darwin 329A and NASA EPO ...
... Cosmology Professor Lynn Cominsky Department of Physics and Astronomy Offices: Darwin 329A and NASA EPO ...
The distributions and ages of refractory objects in the solar nebula
... bits. Solid bodies thus had their motions impeded by the gas, and lost energy and angular momentum to the gas, spiraling inwards over time (Adachi et al., 1976; Weidenschilling, 1977; Cuzzi and Weidenschilling, 2006). The inward drift velocity of solids was a strong function of the size of the solid ...
... bits. Solid bodies thus had their motions impeded by the gas, and lost energy and angular momentum to the gas, spiraling inwards over time (Adachi et al., 1976; Weidenschilling, 1977; Cuzzi and Weidenschilling, 2006). The inward drift velocity of solids was a strong function of the size of the solid ...
Axisymmetry in protoplanetary nebulae: using imaging polarimetry
... any further outflow along the polar axis. Until recently, however, resolved images of CSEs existed for only a few large, bipolar PPNe, compared with a list of PPNe candidates numbering over 100 (Volk & Kwok 1989), and so this model has not been well tested. In many PPNe, the dust shell has thinned t ...
... any further outflow along the polar axis. Until recently, however, resolved images of CSEs existed for only a few large, bipolar PPNe, compared with a list of PPNe candidates numbering over 100 (Volk & Kwok 1989), and so this model has not been well tested. In many PPNe, the dust shell has thinned t ...
Type Ia supernovae as stellar endpoints and cosmological tools
... (no hydrogen in their spectra) from Type II (have hydrogen)2, and then by Elias et al. when they determined that Type Ia supernovae (SNe Ia) were distinct3. We now define Type Ia supernovae as those without hydrogen or helium in their spectra, but with strong ionized silicon (SiII), which has observ ...
... (no hydrogen in their spectra) from Type II (have hydrogen)2, and then by Elias et al. when they determined that Type Ia supernovae (SNe Ia) were distinct3. We now define Type Ia supernovae as those without hydrogen or helium in their spectra, but with strong ionized silicon (SiII), which has observ ...
The Multitude of Molecular Hydrogen Knots in the Helix Nebula 1
... and that point away from the central star. The rim of low-excitation ionize gas has a steep temperature gradient indicating that the knots are photo-evaporating and that ionization fronts are advancing into the knots (O’Dell et al. 2000). A recent anlaysis of knots over the whole Helix nebula by O’D ...
... and that point away from the central star. The rim of low-excitation ionize gas has a steep temperature gradient indicating that the knots are photo-evaporating and that ionization fronts are advancing into the knots (O’Dell et al. 2000). A recent anlaysis of knots over the whole Helix nebula by O’D ...
Spacecraft Navigation Using X-Ray Pulsars
... Theories of general relativity and stellar structure project that on their collapse stars with insufficient mass to create a black hole produce several types of ultradense, compact objects.6,7 One such proposed object is a neutron star (NS).8−10 This object is the result of a massive star that has e ...
... Theories of general relativity and stellar structure project that on their collapse stars with insufficient mass to create a black hole produce several types of ultradense, compact objects.6,7 One such proposed object is a neutron star (NS).8−10 This object is the result of a massive star that has e ...
SystemManual - NRAO Safe Server
... operation. All components have appropriate values assigned to them. The red connections on the right half of the board represent the RF connections. The RF channels are thicker than the normal connections; this is a result of material-based calculations performed with the intent of impedance matchin ...
... operation. All components have appropriate values assigned to them. The red connections on the right half of the board represent the RF connections. The RF channels are thicker than the normal connections; this is a result of material-based calculations performed with the intent of impedance matchin ...
Observations of Jets and Outflows from Young Stars
... the last 7 years, observational and computational capabilities have increased greatly. Major new developments include the detection of X-rays from an increasing number of protostellar outflows, and the measurement of the emission and absorption spectra of some HH objects in the UV (Section 2). At vi ...
... the last 7 years, observational and computational capabilities have increased greatly. Major new developments include the detection of X-rays from an increasing number of protostellar outflows, and the measurement of the emission and absorption spectra of some HH objects in the UV (Section 2). At vi ...
11115002
... though the model of neutron stars were provided by Oppenheimer and Volkoff as early as 1939—who suggested that a neutron star was an ideal gas of free neutrons. Being extremely heavy particles by themselves, neutrons can account for the heavy mass of the neutron stars (~1014 g/cm3). It is believed t ...
... though the model of neutron stars were provided by Oppenheimer and Volkoff as early as 1939—who suggested that a neutron star was an ideal gas of free neutrons. Being extremely heavy particles by themselves, neutrons can account for the heavy mass of the neutron stars (~1014 g/cm3). It is believed t ...
White dwarf binary
... White dwarfs White dwarf limit White dwarf binary Accretion disks Thought question Nova Thought question 2 types of SN Nova or supernova? Standard candles Neutron stars Discovery Crab pulsar Pulsars Pulsars are NS! Magnetic fields Thought question Binaries Spin up Thought question ...
... White dwarfs White dwarf limit White dwarf binary Accretion disks Thought question Nova Thought question 2 types of SN Nova or supernova? Standard candles Neutron stars Discovery Crab pulsar Pulsars Pulsars are NS! Magnetic fields Thought question Binaries Spin up Thought question ...
The redshift of extragalactic nebulae
... extragalactic nebula, as well as the methods that have been used for research into them. In particular, the so-called redshift of extragalactic nebulae is discussed in detail. Various theories that have been advanced to explain this important phenomenon are briefly discussed. Finally it is indicated ...
... extragalactic nebula, as well as the methods that have been used for research into them. In particular, the so-called redshift of extragalactic nebulae is discussed in detail. Various theories that have been advanced to explain this important phenomenon are briefly discussed. Finally it is indicated ...
Gamma-Ray Pulsars - INTEGRAL
... could be far from circular. The bright rims of the emission cones indicate the location of intense particle-photon cascades in the magnetospheres. The emission inside the cones is often found to have a harder spectrum, which could indicate that this radiation has been propagated along magnetic field ...
... could be far from circular. The bright rims of the emission cones indicate the location of intense particle-photon cascades in the magnetospheres. The emission inside the cones is often found to have a harder spectrum, which could indicate that this radiation has been propagated along magnetic field ...
Document
... A pulsar timing array can detect GW from astrophysical sources (or rule out most current models) Parkes Pulsar Timing Array (PPTA) timing 20 MSPs since mid-2004. Goal is ~100 ns rms residuals on at least half of sample; currently have two with rms residuals < 100 ns and seven less 500 ns A pul ...
... A pulsar timing array can detect GW from astrophysical sources (or rule out most current models) Parkes Pulsar Timing Array (PPTA) timing 20 MSPs since mid-2004. Goal is ~100 ns rms residuals on at least half of sample; currently have two with rms residuals < 100 ns and seven less 500 ns A pul ...
Final Stages of Stellar Evolution - supernovae and the synthesis of
... extraordinarily stable rotation → astronomical clocks measurement of gravitational waves ...
... extraordinarily stable rotation → astronomical clocks measurement of gravitational waves ...
Recen t Scien ti c
... and checkout the rst X-rays were observed on August 12, 1999 heralding a new era of high resolution X-ray imaging and spectroscopy. Now slightly more than three years later, Chandra has observed several thousand targets and returned truly unique and outstanding data for scientists around the world ...
... and checkout the rst X-rays were observed on August 12, 1999 heralding a new era of high resolution X-ray imaging and spectroscopy. Now slightly more than three years later, Chandra has observed several thousand targets and returned truly unique and outstanding data for scientists around the world ...
Supernovae and Gamma-Ray Bursts (draft)
... by this interaction with the circumstellar material. Supernovae (e.g., § 8.3) that show evidence for such interactions are sometimes referred to as Type IIa supernovae (SNe IIa), though how this fits into the overall supernova scheme and, in particular, its relation to SNe IIb devies any obvious log ...
... by this interaction with the circumstellar material. Supernovae (e.g., § 8.3) that show evidence for such interactions are sometimes referred to as Type IIa supernovae (SNe IIa), though how this fits into the overall supernova scheme and, in particular, its relation to SNe IIb devies any obvious log ...
The Oort cloud as a remnant of the protosolar nebula
... by Whitworth & Summers (1985, Table 1), there is no solution of Eqs. (10) and (11) in the range of zc /zs from 1.955 to 3755. Hence, the value zc /zs = 1.955 appears to be natural as the second border of acceptability. To avoid numerical difficulties in numerical integration at the true border, we a ...
... by Whitworth & Summers (1985, Table 1), there is no solution of Eqs. (10) and (11) in the range of zc /zs from 1.955 to 3755. Hence, the value zc /zs = 1.955 appears to be natural as the second border of acceptability. To avoid numerical difficulties in numerical integration at the true border, we a ...
Sample pages 1 PDF
... clouds in Earth’s atmosphere. However, these clouds of gas are incredibly tenuous, and by comparison with the air around us, are practically vacuums! But because they’re so big, and the stars inside them are so hot, emission nebula can be very impressive objects when viewed from our distant vantage ...
... clouds in Earth’s atmosphere. However, these clouds of gas are incredibly tenuous, and by comparison with the air around us, are practically vacuums! But because they’re so big, and the stars inside them are so hot, emission nebula can be very impressive objects when viewed from our distant vantage ...
What To See Telescope(Jul-Sept) v1 - One
... scope resolves the cluster all the way to the core, revealing an amazing arrangement of tiny pinprick white and yellow stars of 11th and 12th magnitude. Take a quick glance to the side with averted vision, and the hundreds more stars snap into view in an almost shocking manner. The cluster contains ...
... scope resolves the cluster all the way to the core, revealing an amazing arrangement of tiny pinprick white and yellow stars of 11th and 12th magnitude. Take a quick glance to the side with averted vision, and the hundreds more stars snap into view in an almost shocking manner. The cluster contains ...
The Sky This Month
... • The middle “star” / “fuzzy thing” in Orion’s sword : Mag 4.0. • Bright diffuse nebula with brightest central region about 1° across. • 100 ly away and ~60 ly across. • The closest known star forming region – filled with lots of young stars (Trapezium cluster). • Galileo discovered the Trapezium cl ...
... • The middle “star” / “fuzzy thing” in Orion’s sword : Mag 4.0. • Bright diffuse nebula with brightest central region about 1° across. • 100 ly away and ~60 ly across. • The closest known star forming region – filled with lots of young stars (Trapezium cluster). • Galileo discovered the Trapezium cl ...
SciPoster_Jan2009
... areas of our Galaxy and the Universe, dating all the way back to nearly the beginning of time (e.g., Yan et al. 2005). This dust was formed initially from massive short-lived stars such as Cassiopeia A (e.g., Rho 2008). Dust can also be formed from old, dying stars that used to be like our Sun. Dust ...
... areas of our Galaxy and the Universe, dating all the way back to nearly the beginning of time (e.g., Yan et al. 2005). This dust was formed initially from massive short-lived stars such as Cassiopeia A (e.g., Rho 2008). Dust can also be formed from old, dying stars that used to be like our Sun. Dust ...
Crab Nebula
The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus. It is not, as its name might suggest, in Cancer. The now-current name is due to William Parsons, 3rd Earl of Rosse, who observed the object in 1840 using a 36-inch telescope and produced a drawing that looked somewhat like a crab. Corresponding to a bright supernova recorded by Chinese astronomers in 1054, the nebula was observed later by English astronomer John Bevis in 1731. The nebula was the first astronomical object identified with a historical supernova explosion.At an apparent magnitude of 8.4, comparable to that of Saturn's moon Titan, it is not visible to the naked eye but can be made out using binoculars under favourable conditions. The nebula lies in the Perseus Arm of the Milky Way galaxy, at a distance of about 2.0 kiloparsecs (6,500 ly) from Earth. It has a diameter of 3.4 parsecs (11 ly), corresponding to an apparent diameter of some 7 arcminutes, and is expanding at a rate of about 1,500 kilometres per second (930 mi/s), or 0.5% c.At the center of the nebula lies the Crab Pulsar, a neutron star 28–30 kilometres (17–19 mi) across with a spin rate of 30.2 times per second, which emits pulses of radiation from gamma rays to radio waves. At X-ray and gamma ray energies above 30 keV, the Crab is generally the strongest persistent source in the sky, with measured flux extending to above 10 TeV. The nebula's radiation allows for the detailed studying of celestial bodies that occult it. In the 1950s and 1960s, the Sun's corona was mapped from observations of the Crab's radio waves passing through it, and in 2003, the thickness of the atmosphere of Saturn's moon Titan was measured as it blocked out X-rays from the nebula.